This is NOT Firefox browser.Especially and strictly 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 http://addons.mozilla.orgFeatures: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.