Analyze Download Firefox — Free Web Browser — Mozilla

Download Mozilla Firefox, a free Web browser. Firefox is created by a global non-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today...

Page load speed analysis

  • 62/100

    Normal result
  • 6

    Successful tests
  • 2

    Failed tests
  • First response

    111 ms

  • Resources loaded

    1.3 sec

  • Page rendered

    202 ms

  • Total page load time

    1.6 sec

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We analyzed page load time and found that the first response time was 111 ms and then it took 1.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Page optimization

  • HTML 72.6 kB
    Images 17.4 kB
    Javascripts 0 B
    CSS 0 B

    In fact, the total size of main page is 90.0 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. 40% of websites need less resources to load. HTML takes 72.6 kB which makes up the majority of the site volume.

    • Original 72.6 kB
    • After minification 63.2 kB
    • After compression 11.0 kB

    HTML optimization

    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 9.4 kB, which is 13% 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 61.6 kB or 85% of the original size.

    • Original 17.4 kB
    • After optimization 16.6 kB

    Image optimization

    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.

Network requests diagram

  • site-bundle.5f2462a3ca26.js
  • firefox_new_onboarding_common-bundle.136a56bfe2b9.css
  • firefox_new_onboarding_scene1-bundle.9965c4083e9a.css
  • optimizely-snippet-bundle.7119ca69b1d6.js
  • gtm-snippet-bundle.e956015fe7f3.js
  • common-bundle.bc3cd58a7ff2.js
  • stub-attribution-bundle.6f2d0cdf7104.js
  • firefox_new_scene1-bundle.6d2d044c9823.js
  • 246059135.js
  • gtm.js
  • horizon-night.53e7d3475fd0.svg
  • stars.8398dac91f60.svg
  • tabzilla-static.953a65a1f4a4.png
  • header-logo-inverse.510f97e92635.png
  • icon-sprite.6e9f0f71a7fe.svg
  • btn-google-play.77bdbc935c58.png
  • btn-app-store.1cfd5dba4a92.svg
  • moz-wordmark-light-reverse.cb1bdf6d1de6.svg
  • social-icon-sprite.bf2ae0cd0f01.svg
  • opensans-bold.2abfa530b0d8.woff
  • opensans-regular.fe6f746bb376.woff
  • icon-alert.90f18723c41a.svg
  • opensans-light.c709d7bf4556.woff
  • opensans-semibold.3a18a24d16cb.woff

Our browser made a total of 26 requests to load all elements on the main page. We found that 4% of them (1 request) were addressed to the original, 88% (23 requests) were made to and 4% (1 request) were made to The less responsive or slowest element that took the longest time to load (430 ms) relates to the external source

Additional info on


The browser has sent 20 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 8 to 1 for JavaScripts and as a result speed up the page load time.









Possible request optimization











Good result


As for redirects, our browser was forwarded to before it reached this domain.

IP address uses IP address which is currently shared with 4 other domains. The more sites share the same IP address, the higher the host server’s workload is. It is strongly recommended that the host server should be changed or the hosting provider should be requested to give a different (separate) IP address for this domain.

Poor result

IP Trace

DNS records

Type Host Target/ip TTL Other
A 86400
NS 86400
NS 86400
NS 86400
NS 86400

Language and encoding

Good result


EN en language flag


EN en language flag





Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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.

HTTPS certificate

SSL Certificate has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Normal result

Visitor World Map

The server of is located in United States, but, unfortunately, we cannot identify the countries where the visitors come from and thus it’s impossible to define if the distance can potentially affect the page load time.

Good result

Good result

Social Sharing Optimization

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:

Newly indexed topics

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