Firefox 8 released finally fixes frivolous addons and tubby tabs

Firefox 8 is mostly just a faster, cleaner version of the previous version -- except for a couple of cool features: third-party apps (like AVG or Skype) can no longer install add-ons without your consent, and you can now toggle your saved tabs to load on demand.

Source:
http://www.extremetech.com/computing/103901-firefox-8-released-finally-fixes-frivolous-add-ons-and-tubby-tabs