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#1
I've been experiencing this with FF for a couple of weeks too. No problems with anything else. Have you tried FF in Safe Mode?
I've been using an add-in for Firefox called Memory Restart, can set a threshold level, get an icon on the Toolbar that is green below that level, red above that level and clicking it restarts Firefox, no need to bring up Task Manager to close it which then requires starting Firefox again. Also find it more convenient in the restart that opens everything that was open.