Please consider turning on send info to Mozilla before posting a question. This helps us help you. Yes but not advisable to do so as is a security risk. Would have to go down to ESR 52.4.1 https://www.mozilla.org/en-US/firefox/organizations/all/ which receives security updates only. This seems to work well if there is a Firefox 57 compatible Extension. Can use google search terms : Firefox Extension <old extension name> Comparable Should go to the Developers page and have a look as some are still coding for the change. Please let us know if this solved your issue or if need further assistance.