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Once I close all windows and try to open another I get a message saying"Firefox is still running, you must close all browers before opening a new window. Why is this happening? I have the 3.5.10 Version

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I close all Firefox windows. When I try to open another window later I get a message telling me that Firefox is still running and that I need to close all windows or restart my computer. I have this about 3 times a day this past week but prior to that it was maybe every one or 2 weeks. I had the 3.5.10 Version of Firefox, but have just updated to see if this stops this from happening. But what do I do if it doesn't stop it?

I close all Firefox windows. When I try to open another window later I get a message telling me that Firefox is still running and that I need to close all windows or restart my computer. I have this about 3 times a day this past week but prior to that it was maybe every one or 2 weeks. I had the 3.5.10 Version of Firefox, but have just updated to see if this stops this from happening. But what do I do if it doesn't stop it?

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There are a few possible causes for that error, for details see "Firefox is already running but is not responding" error - How to fix