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Hi, please have a look at [https://support.mozilla.org/en-US/questions/1052604 this Support Forum post.] ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you.''

You can delete the Firefox program folder and do a clean reinstall of the current Firefox release. *http://kb.mozillazine.org/Preferences_not_saved#Other_solutions Download the Firefox installer and save the file to the desktop<br>https://www.mozilla.org/en-US/firefox/all/ Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer. *(32 bit Windows) "C:\Program Files\Mozilla Firefox\" *(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\" It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling. *http://kb.mozillazine.org/Uninstalling_Firefox Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data. ---- *http://kb.mozillazine.org/Profile_folder_-_Firefox *http://kb.mozillazine.org/Profile_backup *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

thank u guys