Firefox Support includes references, tutorials, and troubleshooting guides for users of Firefox 3.5 and up. Only Firefox releases downloaded from www.mozilla.com or provided by Linux with the "Mozilla Firefox" brand name are supported. We do not support other versions, since these versions are not necessarily identical to our official releases and may use different settings or simply look different.
It is common to install Firefox add-ons to add additional functionality to Firefox. Add-ons are not developed by Mozilla, and we do not provide documentation for add-ons.
If you are looking for developer documentation, including documentation for website developers, please visit the Mozilla Developer Center.