C — https://firebase.google.com

Site Health

Score: 76 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

'unsafe-eval' found in script source

Security › Content Security Policy

'unsafe-inline' found in script source

Security › Content Security Policy

Page weighs 25.4 MB (17.4 MB transferred)

Performance › Page Weight Budget

3 link(s) with no accessible text

Accessibility › Link & Button Quality

is missing width/height — may cause layout shift

Performance › Image Optimization

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Ffirebase.google.com)](https://beavercheck.com/results/4d1b5e70-26db-445d-9935-09344c36ac5e)

HTML

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

6.30 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

55.60 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.21 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.30 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

74.98 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

URL	Est Savings
fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	30 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	25 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	20 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:28.526 source:map[column:224 line:165 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:0.544 source:map[column:330 line:243 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:2.445 source:map[column:59 line:242 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
div.homepage-hero__content > div.homepage-hero__body > h1#make-your-app-the-best-it-can-be-with-firebase-and-generative-ai > video `div.homepage-hero__content > div.homepage-hero__body > h1#make-your-app-the-best-it-can-be-with-firebase-and-generative-ai > video`	firebase.google.com/images/homepage/Google_Firebase_LogotoIcon_Black_V01.gif	8.7 MiB	8.7 MiB
Android Studiologo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/android-studio.png	13.6 KiB	13.6 KiB
Slacklogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/slack.png	6.7 KiB	6.7 KiB

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size	Duration
fonts.googleapis.com/css?family=Google+Sans:400,500,600,700	2.5 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	154.4 KiB	3.9 s
/css?family=Google+Sans:400,500\|Roboto:400,400italic,500,...	3.3 KiB	792 ms
/css2?family=Material+Icons&family=Material+Symbols+Outli...	588 B	157 ms
/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..8...	1.1 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 1.5 s 196.5 KiB

URL	Transfer Size	Est Savings
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	153.9 KiB	134.7 KiB
/* Styles inlined from /styles/main.css */ @font-face{font-family:'GMP Icons'; … } …	64.9 KiB	61.8 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 300 ms 511.1 KiB

URL	Transfer Size	Est Savings
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	302.4 KiB	157.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC	154.0 KiB	85.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-N84485	138.9 KiB	61.6 KiB
www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e6411	141.9 KiB	60.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer	128.9 KiB	60.0 KiB
www.googletagmanager.com/gtag/js?id=G-CW55HF8NVT&cx=c&gtm=4e6411	146.7 KiB	59.3 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	58.3 KiB	27.5 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

URL	Total CPU Time	Script Evaluation	Script Parse
Unattributable	1.9 s	154 ms	0.0 ms
firebase.google.com/	1.6 s	34 ms	2.6 ms
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	602 ms	310 ms	37 ms
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	419 ms	200 ms	162 ms
www.googletagmanager.com/gtm.js?id=GTM-N84485	397 ms	337 ms	54 ms
www.googletagmanager.com/gtag/js?id=G-CW55HF8NVT&cx=c&gtm=4e6411	321 ms	267 ms	51 ms
www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC	315 ms	243 ms	56 ms
www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e6411	305 ms	247 ms	55 ms
www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer	256 ms	204 ms	49 ms
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	117 ms	42 ms	1.2 ms
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	99 ms	40 ms	2.0 ms
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	80 ms	0.0 ms	0.0 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Category	Time Spent
Script Evaluation	2.5 s
Other	2.2 s
Style & Layout	1.2 s
Script Parsing & Compilation	515 ms
Rendering	206 ms
Parse HTML & CSS	191 ms
Garbage Collection	81 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

URL	Transfer Size
firebase.google.com/images/homepage/Google_Firebase_LogotoIcon_Black_V01.gif	8.7 MiB
firebase.google.com/static/images/products/icons/build_app_hosting.svg	2.1 MiB
firebase.google.com/static/images/products/icons/build_data_connect.svg	1.5 MiB
firebase.google.com/static/images/products/icons/run_app_distribution.svg	1.2 MiB
firebase.google.com/static/images/products/icons/run_crashlytics.svg	948.8 KiB
firebase.google.com/static/images/products/icons/run_remote_config.svg	947.2 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	302.4 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	154.4 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	154.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC	154.3 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

	URL
Android Studiologo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/android-studio.png
Slacklogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/slack.png
Google Playlogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/playstore.png
Flutterlogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/flutter.png
Firebase AI Logic icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/icons/firebase-ai-logic.svg
Google Adslogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/google-ads.svg
AdMoblogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/ad-mob.svg
Google Marketing Platformlogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/google-marketing-platform.svg
BigQuerylogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/bigquery.svg
Agent Skills icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/icons/firebase-agent-skills.svg
Genkit icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/products/icons/build_genkit_white.svg
Jiralogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/jira.svg
Looker Studiologo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/lookerstudio.svg
Stream to BigQuery icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`
Search with Algolia icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`
Run Payments with Stripe icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Use efficient cache lifetimes

●Layout shift culprits

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 18 user timings

●Avoid long main-thread tasks 20 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 110 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 180 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Failing Elements
div > div.code-picker > devsite-iframe > iframe `div > div.code-picker > devsite-iframe > iframe`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Failing Elements
Easily integrate Firebase with Gemini and the latest AI technology from Google `div.highlights-row-wrapper > div.highlights-row__content > div.content > h3#easily-integrate-firebase-with-gemini-and-the-latest-ai-technology-from-google`

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Source	Description
cgc-ui-boq-autopush.corp.google.com/__/pingz?platform=devsite&page=%2F&ifgr=true	`Failed to load resource: the server responded with a status of 503 (Service Unavailable)`

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No issues in the `Issues` panel in Chrome Devtools

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Ensure CSP is effective against XSS attacks

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Link destination	Link Text
firebase.google.com/integrations	Learn more
firebase.blog/posts/2026/03/nextjs-adapters	Read more
/firebase-developers/streaming-made-easy-with-genkit-a6f9...	Read more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

779 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.13 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

63 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.18 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.61 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

URL	Est Savings
fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	55 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	45 ms
fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2	40 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	15 ms

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:8.19 source:map[column:53 line:254 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:1.207 source:map[column:224 line:165 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:1.802 source:map[column:330 line:243 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:2.777 source:map[column:59 line:242 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:0.104 source:map[column:249 line:247 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:9.866 source:map[type:text value:[unattributed]]] map[reflowTime:2.136 source:map[column:348 line:7 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_devsite_header_module.js urlProvider:network]] map[reflowTime:8.125 source:map[column:106 line:165 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_app_module.js urlProvider:network]] map[reflowTime:3.284 source:map[column:90 line:1 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_devsite_carousel_module.js urlProvider:network]] map[reflowTime:10.352 source:map[column:451 line:1 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_devsite_carousel_module.js urlProvider:network]] map[reflowTime:0.033 source:map[column:288 line:2 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_devsite_carousel_module.js urlProvider:network]] map[reflowTime:0.061 source:map[column:225 line:1 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_devsite_carousel_module.js urlProvider:network]] map[reflowTime:4.452 source:map[column:441 line:22 type:source-location url:https://www.gstatic.com/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424f5334bce4dd1449f7f3a599cf8e09/firebase/js/devsite_devsite_book_nav_module.js urlProvider:network]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

title: Preconnected origins

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size	Duration
/css2?family=Material+Icons&family=Material+Symbols+Outli...	590 B
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	154.4 KiB	453 ms
/css?family=Google+Sans:400,500\|Roboto:400,400italic,500,...	3.2 KiB	247 ms
fonts.googleapis.com/css?family=Google+Sans:400,500,600,700	2.4 KiB
/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..8...	1.1 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
div.homepage-hero__content > div.homepage-hero__body > h1#make-your-app-the-best-it-can-be-with-firebase-and-generative-ai > video `div.homepage-hero__content > div.homepage-hero__body > h1#make-your-app-the-best-it-can-be-with-firebase-and-generative-ai > video`	firebase.google.com/images/homepage/Google_Firebase_LogotoIcon_Black_V01.gif	8.7 MiB	8.8 MiB
Stream to BigQuery Search with Algolia Run Payments with Stripe `div.content-wrapper > section.highlights-row > div.highlights-row-wrapper > div.highlights-row__highlights`	firebase.google.com/images/backgrounds/firebase-gradient.png	3.2 MiB	3.0 MiB
Android Studiologo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/android-studio.png	13.6 KiB	13.6 KiB
Slacklogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/slack.png	6.7 KiB	6.7 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

TTI

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 80 ms 196.2 KiB

URL	Transfer Size	Est Savings
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	153.9 KiB	135.7 KiB
/* Styles inlined from /styles/main.css */ @font-face{font-family:'GMP Icons'; … } …	65.0 KiB	60.5 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 0.0 ms 510.7 KiB

URL	Transfer Size	Est Savings
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	302.4 KiB	156.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC	153.5 KiB	84.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-N84485	139.3 KiB	62.3 KiB
www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e6411	142.0 KiB	60.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer	128.9 KiB	60.0 KiB
www.googletagmanager.com/gtag/js?id=G-CW55HF8NVT&cx=c&gtm=4e6420h2	147.3 KiB	59.5 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	58.3 KiB	27.1 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

URL	Transfer Size
firebase.google.com/images/homepage/Google_Firebase_LogotoIcon_Black_V01.gif	8.7 MiB
firebase.google.com/images/backgrounds/firebase-gradient.png	3.2 MiB
firebase.google.com/static/images/products/icons/build_app_hosting.svg	2.1 MiB
firebase.google.com/static/images/products/icons/build_data_connect.svg	1.5 MiB
firebase.google.com/static/images/products/icons/run_app_distribution.svg	1.2 MiB
firebase.google.com/static/images/products/icons/run_crashlytics.svg	948.8 KiB
firebase.google.com/static/images/products/icons/run_remote_config.svg	947.2 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	302.4 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	154.4 KiB
/devrel-devsite/prod/vb4124e0eb36966d1f5cf3a7ca116e70a424...	154.0 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

	URL
Android Studiologo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/android-studio.png
Slacklogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/slack.png
Google Playlogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/playstore.png
Flutterlogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/flutter.png
Run Payments with Stripe icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	www.gstatic.com/mobilesdk/200629_mobilesdk/stripe_subscriptions_120@2x.png
Firebase AI Logic icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/icons/firebase-ai-logic.svg
Google Adslogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/google-ads.svg
AdMoblogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/ad-mob.svg
Google Marketing Platformlogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/google-marketing-platform.svg
BigQuerylogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/bigquery.svg
Agent Skills icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/icons/firebase-agent-skills.svg
Genkit icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/products/icons/build_genkit_white.svg
Jiralogo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/jira.svg
Search with Algolia icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/products/mods/algolia-search.svg
Stream to BigQuery icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	firebase.google.com/static/images/products/mods/bigquery-export.svg
Looker Studiologo `div.logo-row__container > div.logo-row__logo > a.gc-analytics-event > img`	firebase.google.com/static/images/integrations/lookerstudio.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Max Potential First Input Delay 80 ms

●Use efficient cache lifetimes

●Layout shift culprits

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 18 user timings

●JavaScript execution time 0.7 s

●Minimizes main-thread work 1.9 s

●Avoid long main-thread tasks 7 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 110 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 300 ms

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

Accessibility

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Failing Elements
div > div.code-picker > devsite-iframe > iframe `div > div.code-picker > devsite-iframe > iframe`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Failing Elements
Easily integrate Firebase with Gemini and the latest AI technology from Google `div.highlights-row-wrapper > div.highlights-row__content > div.content > h3#easily-integrate-firebase-with-gemini-and-the-latest-ai-technology-from-google`

These are opportunities to improve keyboard navigation in your application.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Failing Elements
More `devsite-tabs.upper-tabs > nav.devsite-tabs-wrapper > tab.devsite-overflow-tab > button#tab-overflow-button-gUoG`

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
Run Payments with Stripe icon `a > div.highlights-row__card > div.highlights-row__image-wrapper > img.highlights-row__image`	www.gstatic.com/mobilesdk/200629_mobilesdk/stripe_subscriptions_120@2x.png	120 x 240 (0.50)	240 x 240 (1.00)

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Source	Description
firebase.google.com/	`Access to fetch at 'https://cgc-ui-boq-autopush.corp.google.com/__/pingz?platform=devsite&page=%2F&ifgr=true' from origin 'https://firebase.google.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
cgc-ui-boq-autopush.corp.google.com/__/pingz?platform=devsite&page=%2F&ifgr=true	`Failed to load resource: net::ERR_FAILED`

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No issues in the `Issues` panel in Chrome Devtools

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Ensure CSP is effective against XSS attacks

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

SEO

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Link destination	Link Text
firebase.google.com/integrations	Learn more
firebase.blog/posts/2026/03/nextjs-adapters	Read more
/firebase-developers/streaming-made-easy-with-genkit-a6f9...	Read more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Results for https://firebase.google.com

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Navigation

Best Practices

General

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Navigation

Best Practices

User Experience

General

SEO

Content Best Practices

Keyboard Shortcuts