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mozillafirefox.com screenshot

Report Summary

  • 80

    Performance

    Renders faster than
    86% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

mozillafirefox.com

Get Firefox browser — Mozilla (US)

Page Load Speed

1.6 sec in total

First Response

223 ms

Resources Loaded

1.2 sec

Page Rendered

216 ms

mozillafirefox.com screenshot

About Website

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Key Findings

We analyzed Mozillafirefox.com page load time and found that the first response time was 223 ms and then it took 1.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

mozillafirefox.com performance score

80

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.3 s

74/100

10%

LCP (Largest Contentful Paint)

Value3.7 s

59/100

25%

SI (Speed Index)

Value2.6 s

97/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.218

57/100

15%

TTI (Time to Interactive)

Value2.3 s

99/100

10%

Network Requests Diagram

mozillafirefox.com

223 ms

mozillafirefox.com

259 ms

272 ms

site.de11ea2ffbeb.js

5 ms

protocol-firefox.766f7f0c044a.css

4 ms

Our browser made a total of 52 requests to load all elements on the main page. We found that 4% of them (2 requests) were addressed to the original Mozillafirefox.com, 94% (49 requests) were made to Mozilla.org and 2% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (272 ms) relates to the external source Mozilla.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 57.0 kB (28%)

Content Size

200.6 kB

After Optimization

143.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Mozillafirefox.com main page is 200.6 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. 50% of websites need less resources to load. Images take 74.1 kB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 54.5 kB

  • Original 66.5 kB
  • After minification 56.4 kB
  • After compression 12.0 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 10.1 kB, which is 15% 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 54.5 kB or 82% of the original size.

Image Optimization

-0%

Potential reduce by 0 B

  • Original 74.1 kB
  • After minification 74.1 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. Mozilla Firefox images are well optimized though.

JavaScript Optimization

-4%

Potential reduce by 1.5 kB

  • Original 40.9 kB
  • After minification 40.9 kB
  • After compression 39.4 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. This website has mostly compressed JavaScripts.

CSS Optimization

-5%

Potential reduce by 1.0 kB

  • Original 19.1 kB
  • After minification 19.1 kB
  • After compression 18.1 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Mozillafirefox.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 24 (51%)

Requests Now

47

After Optimization

23

  • Images
  • JavaScript
  • CSS

The browser has sent 47 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Mozilla Firefox. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

mozillafirefox.com

mozillafirefox.com

223 ms

mozillafirefox.com

mozillafirefox.com

259 ms

272 ms

site.de11ea2ffbeb.js

site.de11ea2ffbeb.js

5 ms

protocol-firefox.766f7f0c044a.css

protocol-firefox.766f7f0c044a.css

4 ms

protocol-emphasis-box.4ddd0fb346b4.css

protocol-emphasis-box.4ddd0fb346b4.css

12 ms

firefox-browsers-products.a084040fae8e.css

firefox-browsers-products.a084040fae8e.css

13 ms

firefox-app-store-banner.a91d73749b32.css

firefox-app-store-banner.a91d73749b32.css

14 ms

gtm-snippet.a788d552f536.js

gtm-snippet.a788d552f536.js

17 ms

gtm.js

gtm.js

160 ms

menu.79f1f0c795df.svg

menu.79f1f0c795df.svg

54 ms

logo-word-hor.e20791bb4dd4.svg

logo-word-hor.e20791bb4dd4.svg

25 ms

logo.eb1324e44442.svg

logo.eb1324e44442.svg

48 ms

logo.aac3e33175cb.svg

logo.aac3e33175cb.svg

45 ms

logo.d97e5516f9e6.svg

logo.d97e5516f9e6.svg

51 ms

logo.17446bc33a5d.svg

logo.17446bc33a5d.svg

55 ms

logo.c648f487bfb8.svg

logo.c648f487bfb8.svg

54 ms

logo.683083c53b93.svg

logo.683083c53b93.svg

62 ms

icon-mdn-plus.f54475f980ab.svg

icon-mdn-plus.f54475f980ab.svg

70 ms

logo.41d42822c8fb.svg

logo.41d42822c8fb.svg

62 ms

icon-mdn-web-docs.9ed01cfe71c7.svg

icon-mdn-web-docs.9ed01cfe71c7.svg

60 ms

icon-innovation-projects.11f189479119.svg

icon-innovation-projects.11f189479119.svg

69 ms

icon-common-voice.127fa3f5dcb0.svg

icon-common-voice.127fa3f5dcb0.svg

72 ms

logo.fedb52c912d6.svg

logo.fedb52c912d6.svg

76 ms

zap-11.b89f1adfc49b.svg

zap-11.b89f1adfc49b.svg

78 ms

desktop.10257b48f669.jpg

desktop.10257b48f669.jpg

78 ms

mobile.c3dfb18740ff.jpg

mobile.c3dfb18740ff.jpg

78 ms

btn-google-play.77bdbc935c58.png

btn-google-play.77bdbc935c58.png

73 ms

btn-app-store.1cfd5dba4a92.svg

btn-app-store.1cfd5dba4a92.svg

79 ms

enterprise.d47beba5c173.jpg

enterprise.d47beba5c173.jpg

82 ms

logo-flat-white.7310b86a6954.svg

logo-flat-white.7310b86a6954.svg

80 ms

logo-white.d42a8b52e44c.svg

logo-white.d42a8b52e44c.svg

185 ms

logo-word-hor-white.8e4c6167b986.svg

logo-word-hor-white.8e4c6167b986.svg

62 ms

white.7f50edd82090.svg

white.7f50edd82090.svg

60 ms

white.55edaf2ee952.svg

white.55edaf2ee952.svg

64 ms

white.a7014a6150b3.svg

white.a7014a6150b3.svg

63 ms

white.cdc0e910cc1e.svg

white.cdc0e910cc1e.svg

62 ms

white.599403de7ac0.svg

white.599403de7ac0.svg

66 ms

white.aa5334e85bae.svg

white.aa5334e85bae.svg

65 ms

white.4f314c43c69d.svg

white.4f314c43c69d.svg

67 ms

Inter-Regular.1a7f90ff1f1e.woff

Inter-Regular.1a7f90ff1f1e.woff

51 ms

Inter-Bold.2767206dcd8d.woff

Inter-Bold.2767206dcd8d.woff

86 ms

sentry.4a8235bda9fb.js

sentry.4a8235bda9fb.js

37 ms

lib.620f58c8d261.js

lib.620f58c8d261.js

39 ms

ui.e816760687b9.js

ui.e816760687b9.js

38 ms

fxa.478f82923b55.js

fxa.478f82923b55.js

72 ms

data.e7de38424803.js

data.e7de38424803.js

71 ms

stub-attribution.88dfff95a1b1.js

stub-attribution.88dfff95a1b1.js

75 ms

fxa_form.2a36187cd9e4.js

fxa_form.2a36187cd9e4.js

75 ms

firefox-browsers-products.360ef037ee47.js

firefox-browsers-products.360ef037ee47.js

73 ms

firefox-app-store-banner.db10f461d479.js

firefox-app-store-banner.db10f461d479.js

77 ms

app-icon-512.782bf4aa77fd.jpg

app-icon-512.782bf4aa77fd.jpg

87 ms

Accessibility Review

mozillafirefox.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

mozillafirefox.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

mozillafirefox.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 Mozillafirefox.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 Mozillafirefox.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

mozillafirefox.com

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