Very likely you can not downgrade your Firefox profile version 57 to version 52. irefox-esrĪfter adding the PPA (you can add PPAs through Software Sources program, just add ppa:jonathonf/firefox-esr there), you can install firefox-esr through Software Manager.īefore you do any of this I urge you to make a backup of your bookmarks and passwords, and note which extensions you have installed. You can add this PPA to your system to be able to install Firefox ESR. That is supported till August 28th this year (see, on May 8th Firefox 60 because the new ESR but Firefox ESR version 52 should be supported for a but longer) so leaves you with a good many months to find replacements for your extensions (either on Firefox or some other browser). Every Firefox release includes security updates and with your web browser being the most vulnerable part of your system, I strongly urge and recommend you to use a web browser version that gets security updates!Īs an alternative you can use Firefox ESR version 52. You should not want to do this, regardless of the now long unmaintained extensions you want to keep using.

Revert to firefox 56