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Firefox crashes and won't restart

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I have a 2010 Macbook Pro, and I just did a clean installation of the entire operating system because I was having these problems (and more) before.

My Firefox will attempt to send a crash report after I close it (but says that for this crash, it cannot create a report), and then refuses to open until I restart the computer. I only get an error message that says that there is another copy of Firefox already open, and that there can already be one. I've already tried killing all firefox processes in the Terminal, but the computer then reports that there are no processes to be killed. When I restart, the browser opens up to pages that I had open maybe an hour ago.

I doubt that a clean installation will help, as I just cleanly installed Firefox on a cleanly installed OS.

I have a 2010 Macbook Pro, and I just did a clean installation of the entire operating system because I was having these problems (and more) before. My Firefox will attempt to send a crash report after I close it (but says that for this crash, it cannot create a report), and then refuses to open until I restart the computer. I only get an error message that says that there is another copy of Firefox already open, and that there can already be one. I've already tried killing all firefox processes in the Terminal, but the computer then reports that there are no processes to be killed. When I restart, the browser opens up to pages that I had open maybe an hour ago. I doubt that a clean installation will help, as I just cleanly installed Firefox on a cleanly installed OS.

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Hi Asparagus, I noticed that you were on version 31. There was an issue in that version that sounds similar to one that detected that there was another version of Firefox running. However just to clarify, what version are you seeing this happen?