Surprised nobody already suggested some kind of mouse gestures extension. I use foxy gestures and once you learn a few gestures (starting with closing a tab and undoing it) it becomes hard to live without it! Gesturefy is also a popular alternative.
Firefox
A community for discussion about Mozilla Firefox.
While we're on the subject, does anyone know of a way to block those scroll triggered pop-ups that are everywhere these days? You know the ones, you get a little bit down a page, then:
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Any help is greatly appreciated.
You can try PopUpOFF. It's not perfect and can be over-aggressive at hiding legitimate popups but it's worth a try.
Behind the Overlay.
https://addons.mozilla.org/en-US/firefox/addon/swift-selection-search/
"Swiftly access your search engines in a popup panel when you select text in a webpage."
Tab Center Reborn (and some css to hide the top tab bar) for sidebar tabs.
How it compares ro TreeStyleTabs?
I don't want to say its name, cause I worry (maybe unnecessarily) about making it a target, but there's a downloader for YouTube that's the only extension I've ever paid for.
uBlacklist is great for hiding horrid search results.
He thanks, finally rid of userbenchmark.com results.