You could try "Reset Firefox". No guarantees, but it fixes a lot of performance problems like the ones you're seeing, while preserving history, passwords, book

You could try "Reset Firefox". No guarantees, but it fixes a lot of performance problems like the ones you're seeing, while preserving history, passwords, bookmarks, cookies, etc. See https://support.mozilla.org/en-US/kb/reset-firefox-easily-fixes-most-problems https://support.mozilla.org/en-US/kb/reset-firefox-easily-fi... for details.