This is NOT Firefox browser.
Especially for Mozilla Firefox Developers who develop add-on for Firefox web browser.
A reference guide to Mozilla Firefox developer. Firefox Add-on Developer Guide consists of all the documentation required to develop and publish the add-on on <a href="https://www.google.com/url?q=http://addons.mozilla.org&sa=D&usg=AFQjCNGerUWlnsEbevemcAT-yNSUCE325g" target="_blank">http://addons.mozilla.org</a>
Features:
1. Firefox usage stats.
2. Firefox market share.
3. Gecko versions.
4. Lists 20+ distribution channels for Firefox extensions, Apps, themes and add-ons.
5. Javascript performance statistics on different browsers.