Hi, please uninstall Firefox. Note: your Firefox Profile is saved. But you should make a back up be

Hi, please uninstall Firefox. Note: your Firefox Profile is saved. But you should make a back up before you do :

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 59.0 with a Full Version Installer

https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.