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If you have these or similar programs installed, try installing a newer version or else uninstall the application if you don't need it.
Note: You can view and selectively disable Windows shell extensions added by third-party (non-Microsoft) applications with the Shell Ex View utility, to determine if one of them is causing the issue.
If Firefox hangs when accessing page history (e.g., when you click History in the Firefox menu or when you try to clear the browsing history) the file that stores your browsing history may be damaged. For some users, Firefox consumes excessive amounts of memory and may slow down or hang in situations that include being open for long periods of time, after downloading or saving images or other files, or after extensive use with multiple tabs open.     (For other problems loading websites, see Error loading websites).
Firefox may become very slow to respond because of badly coded Java Script causing infinite loops on certain websites .
If you see a "Close Firefox" dialog when starting Firefox, with the message Firefox is already running, but is not responding.This problem can usually be cleared by closing the window or tab for that website.