Try clear your recente history: *[https://support.mozilla.org/en-US/kb/remove-recent-browsing-search-and-download-history Clear recent history] Try also start in safe mode: *[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in safe mode] Post a screenshot of your problem: *[https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem Create a screenshot of the problem]