In it, give the command firefox –allow-downgrade. For example, if you have Firefox 104 installed, downgrade only down to version 102. My suggestion is not to downgrade more than 2 major versions. If you use a very very old version, then it won’t work at all. Download an older version of Firefox from and install it on your system.They can be found in %AppData%\Mozilla\Firefox\Profiles directory. First of all make a backup of Firefox user profile folders.Here is how we can work around this problem and use an older version of Firefox: To protect your information, create a new profile for this installation of Firefox.” The information message reads, “Using an older version of Firefox can corrupt bookmarks and browsing history already saved to an exiting Firefox profile. If you install an older version of Firefox and try to run it, you will be give a warning about the same and it will not allow you to run it. There could be any number of reasons for doing this, but it is not so straightforward because the user profiles have a preferences file in which the last version of Firefox is recorded. There are many times when we want to go back a couple of steps and use an older version of the Firefox web browser.
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