14.9 sec in total
310 ms
6.3 sec
8.3 sec
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Visit mozilla.comWe analyzed Mozilla.com page load time and found that the first response time was 310 ms and then it took 14.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.
mozilla.com performance score
name
value
score
weighting
Value2.7 s
60/100
10%
Value2.9 s
80/100
25%
Value3.3 s
91/100
10%
Value1,370 ms
16/100
30%
Value0.182
67/100
15%
Value7.8 s
44/100
10%
310 ms
476 ms
70 ms
31 ms
52 ms
Our browser made a total of 34 requests to load all elements on the main page. We found that 6% of them (2 requests) were addressed to the original Mozilla.com, 85% (29 requests) were made to Mozilla.org and 3% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (2.4 sec) relates to the external source Blog.mozilla.org.
Page size can be reduced by 957.0 kB (55%)
1.7 MB
777.6 kB
In fact, the total size of Mozilla.com main page is 1.7 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 55% of websites need less resources to load. Javascripts take 1.2 MB which makes up the majority of the site volume.
Potential reduce by 78.4 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 14.2 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 78.4 kB or 84% of the original size.
Potential reduce by 8.9 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 images are well optimized though.
Potential reduce by 866.7 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 866.7 kB or 70% of the original size.
Potential reduce by 2.9 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. Mozilla.com needs all CSS files to be minified and compressed as it can save up to 2.9 kB or 79% of the original size.
Number of requests can be reduced by 7 (28%)
25
18
The browser has sent 25 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 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 8 to 1 for JavaScripts and as a result speed up the page load time.
mozilla.com
310 ms
www.mozilla.com
476 ms
70 ms
site-bundle.5f2462a3ca26.js
31 ms
pebbles-bundle.7c2533fcb8ec.css
52 ms
firefox-hub-home-bundle.efebd922ea2a.css
237 ms
gtm-snippet-bundle.e956015fe7f3.js
235 ms
common-bundle.bc3cd58a7ff2.js
191 ms
stub-attribution-bundle.6f2d0cdf7104.js
218 ms
firefox-hub-home-bundle.49ca2458ab3d.js
190 ms
firefox-update-notification-bundle.833e19e1384b.js
929 ms
gtm.js
1822 ms
memory-usage-by-browser-and-operating-system-600x315.png
2447 ms
moz-wordmark-dark-reverse.2cbc28bb9895.svg
1160 ms
down-arrow-light-sprite.3c238dd79c17.png
1159 ms
subnav-expand.023729cb5b3a.svg
1213 ms
fb-share-tips.c00975453739.png
1159 ms
safer-logins.a578d3224c76.png
1158 ms
css-grid-demo.519391163c6a.png
1158 ms
web-assembly.899f5b709746.png
1279 ms
logo-wordmark-large-noshadow.bc14682067d3.png
1279 ms
texture-private.901cb3cae37d.jpg
1223 ms
cta-arrow.580afc562e62.svg
1280 ms
sync-large.9ec8bcd29bae.jpg
1258 ms
critters.85be3ba27b7e.png
1258 ms
moz-wordmark-light-reverse.cb1bdf6d1de6.svg
1335 ms
social-icon-sprite.bf2ae0cd0f01.svg
1333 ms
opensans-regular.fe6f746bb376.woff
601 ms
opensans-bold.2abfa530b0d8.woff
587 ms
ZillaSlab-Regular.f7120c75de27.woff
586 ms
ZillaSlab-Bold.be1d6507cb98.woff
586 ms
ZillaSlab-RegularItalic.8eb5354ed8ae.woff
586 ms
ZillaSlab-BoldItalic.dd3d114d6c53.woff
586 ms
analytics.js
414 ms
mozilla.com accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
mozilla.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
mozilla.com SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
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
Document uses legible font sizes
Tap targets are not sized appropriately
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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.
mozilla.com
Open Graph data is detected on the main page of Mozilla. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: