Export your bookmarks to an HTML file, completely uninstall, and reinstall last of 3.x series. Yeh, I'm probably going back too. Big memory leak in FF4.
I opened a FF4 page to Google as a test before going to bed, next morning the FF process had sucked up 500MB of memory.
I could have done some deeper testing to see if it was a specific addon/plugin (actually running a pretty slimmed down version) but I don't want to spend hours testing FF - rather go fishing.
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