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- adds support for HTML5
- adds support for WebM video format
- deprecated interface (nsIJSON) removed
- fixes zombie compartment memory leaks
- adds new YouTube downloadable video types
- some of the help popups on settings pages weren't working
- the yellow bar for creating a new SearchMenu wasn't showing if the add-on bar was disabled
- fixed detection of downloadables on the selected tab after fresh start of Firefox
- incorporated Firefox 4 compatibility changes
- dramatically improved loading speed by removing all server-dependent initializations and icons
- improved the SearchMenu user interface by moving BestGuesses to a sub-menu and making QuickSearch more reliable