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 onhttp://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.