Ctrl+Tab is handy for cycling through your Firefox tabs, but Lifehacker reader Teejmya shows us that with a small about:config tweak in Firefox 4, you can get really nice Alt+Tab style preview when you use it.
In Firefox 4 (b12 at least), if you hop into
about:config and change
browser.ctrlTab.previews to true, then Ctrl+Tab changes tabs with a very nice looking little popup.
It's a simple tweak that takes about five seconds, but boy does it make Ctrl+Tab switching much easier to use!