Please explain the problem in detail&#46; What happens? What is/are the exact error message(s) ? Note: Users have had problems when trying to remove history from their profile. Especially when the file storing the history ('''places.sqlite''' : History and Bookmarks) is very large. If you want to remove all the history, what you can do is remove this file. The next time Firefox is started, it should recover a backup bookmarks file. Type '''about:support'''<enter> in the address box&#46; Under the page logo on the left side, you will see '''Application Basics&#46; ''' Under this find '''Profile Folder&#46; ''' To its right press the button '''Show Folder&#46; ''' This will open your file browser to the current Firefox profile&#46; Now '''Close Firefox&#46; ''' Locate the above file&#46; Then rename or delete it&#46; Restart Firefox&#46;