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Get message that "Firefox is not responding."
I hope this is not a duplicate of a previous question. Several days ago, my computer started freezing and hanging up; I started getting message: "Firefox is not responding. Do you want to close program or wait for program to respond." I have Windows 7 and the latest version of F/F. I have restarted computer, cleared cookies and cache. I am not very knowledgeable so have not restarted in safe mode, refreshed F/F or reinstalled F/F. I have checked plugins and they are up to date. Any advice would be very much appreciated. Thank you.