a firefox process is still running after I exit from firefox
Periodically I notice Firefox getting slower and slower (e.g., scrolling gets jerky) and consuming a lot of memory (up to 2GB). If I File -> Exit from Firefox and watch the processes in the Windows Task Manager, I sometimes (but not always) see that a Firefox process continues to run and its memory has not been freed. After several minutes, the process still shows no sign of going away. If I manually end the process and restart Firefox, it performs well -- until it begins slowing down again.
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Over at MozillaZine, they have compiled a long list of troubleshooting steps for Firefox not shutting down cleanly:
http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit
However, it sounds as though your issue may be something happening while you use Firefox. If the above doesn't help, you may want to describe the types of content that seem to be related to the issues.