Mozilla released Firefox 8 Beta which is available for download from Mozilla website, this Firefox release added Twitter search as one of the search engine to let you search for hashtags and usernames on twitter and this version lets you restore tabs on demand and automatically disables third-party installed add-ons .
What’s new in Firefox 8 beta
- Add-ons installed by third party programs are now disabled by default
- Added a one-time add-on selection dialog to manage previously installed add-ons
- Added Twitter to the search bar
- Added a preference to load tabs on demand, improving start-up time when windows are restored
- Improved tab animations when moving, reordering, or detaching tabs
- Improved performance and memory handling when using <audio> and <video> elements
- Added CORS support for cross-domain textures in WebGL
- Added support for HTML5 context menus
- Added support for insertAdjacentHTML
- Improved CSS hyphen support for many languages
- Improved WebSocket support
- Fixed several stability issues
You can check Firefox 8 release notes here.