Tools & Wizards About Us
en-us.www.mozilla.com screenshot

Report Summary

  • 78

    Performance

    Renders faster than
    85% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 89% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    81% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

en-us.www.mozilla.com

Firefox - Protect your life online with privacy-first products — Mozilla

Page Load Speed

970 ms in total

First Response

155 ms

Resources Loaded

545 ms

Page Rendered

270 ms

en-us.www.mozilla.com screenshot

About Website

Welcome to en-us.www.mozilla.com homepage info - get ready to check En Us Www Mozilla best content for United States right away, or after learning these important things about en-us.www.mozilla.com

Firefox is more than a browser. Learn more about Firefox products that handle your data with respect and are built for privacy anywhere you go online.

Visit en-us.www.mozilla.com

Key Findings

We analyzed En-us.www.mozilla.com page load time and found that the first response time was 155 ms and then it took 815 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

en-us.www.mozilla.com performance score

78

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

65/100

10%

LCP (Largest Contentful Paint)

Value2.9 s

80/100

25%

SI (Speed Index)

Value2.6 s

97/100

10%

TBT (Total Blocking Time)

Value240 ms

85/100

30%

CLS (Cumulative Layout Shift)

Value0.169

70/100

15%

TTI (Time to Interactive)

Value6.8 s

54/100

10%

Network Requests Diagram

en-us.www.mozilla.com

155 ms

8 ms

site-bundle.6009f70fa7b1.js

3 ms

firefox_new_common-bundle.f01e727b3907.css

10 ms

firefox_new_scene1-bundle.decbfd5ad783.css

14 ms

Our browser made a total of 21 requests to load all elements on the main page. We found that 5% of them (1 request) were addressed to the original En-us.www.mozilla.com, 71% (15 requests) were made to Mozilla.org and 10% (2 requests) were made to 246059135.log.optimizely.com. The less responsive or slowest element that took the longest time to load (172 ms) relates to the external source 246059135.log.optimizely.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 177.8 kB (59%)

Content Size

298.8 kB

After Optimization

121.0 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of En-us.www.mozilla.com main page is 298.8 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 15% of websites need less resources to load. Javascripts take 198.5 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 46.3 kB

  • Original 57.6 kB
  • After minification 51.0 kB
  • After compression 11.2 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 6.5 kB, which is 11% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 46.3 kB or 80% of the original size.

Image Optimization

-2%

Potential reduce by 845 B

  • Original 42.7 kB
  • After minification 41.8 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. En Us Www Mozilla images are well optimized though.

JavaScript Optimization

-66%

Potential reduce by 130.6 kB

  • Original 198.5 kB
  • After minification 198.5 kB
  • After compression 67.9 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 130.6 kB or 66% of the original size.

Requests Breakdown

Number of requests can be reduced by 5 (33%)

Requests Now

15

After Optimization

10

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 15 CSS, Javascripts, AJAX and image requests in order to completely render the main page of En Us Www Mozilla. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

en-us.www.mozilla.com

en-us.www.mozilla.com

155 ms

8 ms

site-bundle.6009f70fa7b1.js

site-bundle.6009f70fa7b1.js

3 ms

firefox_new_common-bundle.f01e727b3907.css

firefox_new_common-bundle.f01e727b3907.css

10 ms

firefox_new_scene1-bundle.decbfd5ad783.css

firefox_new_scene1-bundle.decbfd5ad783.css

14 ms

246059135.js

246059135.js

43 ms

common-bundle.f0a21783cc6e.js

common-bundle.f0a21783cc6e.js

31 ms

firefox_new_scene1-bundle.06d81bed1d54.js

firefox_new_scene1-bundle.06d81bed1d54.js

18 ms

geo2.js

geo2.js

126 ms

event

event

172 ms

gtm.js

gtm.js

165 ms

bg-noise.1c5779b1a813.png

bg-noise.1c5779b1a813.png

83 ms

tabzilla-static.953a65a1f4a4.png

tabzilla-static.953a65a1f4a4.png

16 ms

header-firefox.98d0a02c957f.png

header-firefox.98d0a02c957f.png

22 ms

firefox-logo.d3cb43a0a16f.png

firefox-logo.d3cb43a0a16f.png

22 ms

browser-linux.025d07934326.png

browser-linux.025d07934326.png

64 ms

OpenSans-Regular-webfont.2696e36f12c5.woff

OpenSans-Regular-webfont.2696e36f12c5.woff

63 ms

OpenSans-Bold-webfont.b9dc2e7aefec.woff

OpenSans-Bold-webfont.b9dc2e7aefec.woff

39 ms

OpenSans-Light-webfont.1c8075cacedb.woff

OpenSans-Light-webfont.1c8075cacedb.woff

61 ms

OpenSans-Semibold-webfont.26755c681f8f.woff

OpenSans-Semibold-webfont.26755c681f8f.woff

62 ms

event

event

76 ms

Accessibility Review

en-us.www.mozilla.com accessibility score

96

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

en-us.www.mozilla.com best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

SEO Factors

en-us.www.mozilla.com SEO score

92

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Links do not have descriptive text

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise En-us.www.mozilla.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that En-us.www.mozilla.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

en-us.www.mozilla.com

Open Graph data is detected on the main page of En Us Www Mozilla. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: