Please : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles also https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer then https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings TEST IT.........more..... Update Video Card Drivers and if issue is fine above then it is Extensions and need to test them as you put them back, slowly 1 at a time and test also could be a combo when installed is causing the issue so do Test... Could be Profile : https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Make a new one and TEST....... Please let us know if this solved your issue or if need further assistance.