Mozilla.org Internet for people, not profit — Mozilla
Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.
mozilla.org Mobile Performance
58/100
These metrics represent real-world Chrome users experience viewing mozilla.org on mobile devices. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Metrics
Largest Contentful Paint9/100 6.6 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint36/100 4.6 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive68/100 5.7 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index70/100 4.6 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Total Blocking Time100/100 70 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (11)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Avoid multiple page redirects
Potential savings of 1,890 ms
1,890 ms
Serve images in next-gen formats
Potential savings of 237 KiB
1,200 ms
Eliminate render-blocking resources
Potential savings of 650 ms
648 ms
Remove unused JavaScript
Potential savings of 24 KiB
150 ms
Properly size images
Potential savings of 23 KiB
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid an excessive DOM size
1,258 elements
Minimizes main-thread work
1.9 s
Keep request counts low and transfer sizes small
34 requests • 1,177 KiB
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
11 chains found
Avoid long main-thread tasks
11 long tasks found
Passed Audits (17)
Uses passive listeners to improve scrolling performance
Use video formats for animated content
Enable text compression
Defer offscreen images
Potential savings of 326 KiB
Minimize third-party usage
Third-party code blocked the main thread for 30 ms
Minify JavaScript
Preconnect to required origins
Avoids enormous network payloads
Total size was 1,177 KiB
Uses efficient cache policy on static assets
2 resources found
All text remains visible during webfont loads
JavaScript execution time
0.4 s
Initial server response time was short
Root document took 70 ms
Preload key requests
Remove unused CSS
Minify CSS
Avoids `document.write()`
Efficiently encode images
mozilla.org Mobile SEO
93/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (1)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Links do not have descriptive text
5 links found
Passed Audits (13)
Links are crawlable
Document has a valid `rel=canonical`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Tap targets are sized appropriately
100% appropriately sized tap targets
Document uses legible font sizes
100% legible text
Document has a valid `hreflang`
Page isn’t blocked from indexing
robots.txt is valid
Document has a meta description
Image elements have `[alt]` attributes
Page has successful HTTP status code
Document has a `<title>` element
mozilla.org Mobile Best Practices
85/100
These checks highlight opportunities to improve the overall code health of mozilla.org mobile page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (2)
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
2 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Passed Audits (12)
Detected JavaScript libraries
Avoids deprecated APIs
Serves images with appropriate resolution
Links to cross-origin destinations are safe
Page has the HTML doctype
Properly defines charset
Displays images with correct aspect ratio
No browser errors logged to the console
Allows users to paste into password fields
Avoids requesting the geolocation permission on page load
Avoids Application Cache
Avoids requesting the notification permission on page load
mozilla.org Mobile Progressive Web App
50/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (8)
Installable
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Does not use HTTPS
1 insecure request found
PWA Optimized
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not set a theme color for the address bar.
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Passed Audits (6)
Content is sized correctly for the viewport
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Provides a valid `apple-touch-icon`
Page load is fast enough on mobile networks
mozilla.org Mobile Accessibility
98/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (1)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Passed Audits (20)
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
ARIA IDs are unique
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
Background and foreground colors have a sufficient contrast ratio
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Form elements have associated labels
`[aria-hidden="true"]` is not present on the document `<body>`
`[aria-*]` attributes match their roles
`[aria-hidden="true"]` elements do not contain focusable descendents
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[lang]` attributes have a valid value
Image elements have `[alt]` attributes
Document has a `<title>` element
`<html>` element has a valid value for its `[lang]` attribute
`[aria-*]` attributes have valid values
`<html>` element has a `[lang]` attribute
`[id]` attributes on active, focusable elements are unique
The page contains a heading, skip link, or landmark region
Links have a discernible name
Mobile Usability
99/100
These checks validate how easily a visitor can use mozilla.org on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
47/100
These checks analyze the performance of mozilla.org on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (7)
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Prioritize visible content
Enable compression
Optimize images
Minify HTML
Leverage browser caching
Passed Audits (3)
Reduce server response time
Minify CSS
Minify JavaScript
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