Those watching the FTP servers may have been able to snag it a bit early, but Mozilla's now announced that Firefox 8 is officially available for Windows, Mac and Linux computers. The big addition, such as it is, is built-in Twitter search, which will let you search for topics, hashtags or usernames right in the main search box. You'll also get the usual raft of performance and security improvements, as well as some new ways to manage tabs and add-ons. Alongside it comes a new version of Firefox for Android
, which includes a new password manager, and the ability to add home screen icons for bookmarked pages or web apps.