Unload inactive tabs' pages from memory, and session restore them if/when their tab is next selected. This could significantly reduce Firefox RAM consumption when many tabs are open, and also greatly speed up restarts (as tabs would only be loaded as needed rather than restoring all tabs immediately). Obviously care would have to be taken with things like Flash applications which might lose their state if reloaded.416 votes
I’m postponing this slightly while I look at other things like compatibility with the upcoming Firefox 4.
The tab bar (especially when vertical) should have a find-as-you-type search box letting you filter the tab bar by title and url (and optionally page text) to help you find tabs faster. See mockup of the tab bar after filtering by "goog": http://tinyurl.com/tk-mockup-searchresults129 votes
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