Now Firefox will start, but it will immediately try to update itself, and it will occasionally notify you about it. You need to add the flag -allow downgrade at the end. Now Firefox has been reinstalled and your settings copied, but when it detects that your profile is from an older version, it will refuse to start.Įdit your Firefox startup shortcut. Copy the contents of your old directory to the new one, overwriting anything there.įirefox cannot be running when you do this because it locks some of the profile files while running, preventing a clean copy. It will be in the same directory as the old one and also have an unpronouncable name. Locate your new profile directory (directions in step 1). If you accidentally start Firefox, you may need to reboot again, or even restart the process.
Possibly you can just uninstall Firefox properly and not have to reboot like I did, but browsers get their hooks deep into everything, and in Windows especially, a reboot is best.) The About menu in Firefox said version 86, but it was 88, and the Windows list of installed programs showed 88. (The first time I tried this I did not reboot, and it turned out Firefox 88 was actually still installed. There may be associated pieces of software with it, also called "Mozilla Firefox ", like the updater. A directory of all previous versions is here. Since Firefox cannot be running while we update it, this must be done before anything else.ĭownload the version of Firefox you want. You can also locate this folder from Firefox by going to Hamburger menu->Help->Troubleshooting Information->Application Basics->Profile Folder->Open Folder. In recent versions it will have a name like "fault", but yours could be named something different. On Windows your profile folder is in %APPDATA%\Mozilla\Firefox\Profiles\. This step can be skipped, although aside from protecting data, it's helpful to be able to refer to the original directory structure later. They are for Windows, although the real key to starting Firefox after the change (adding -allow-downgrade to your startup shortcut) is the same for Linux. These are instructions to install the version of Firefox you want and keep it that version, while also keeping your user profile intact.
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