Right-click on compatibility.ini, select Properties, select Read only and click on OK button. In the folder that opens, double-click on compatibility.ini and remove all of its content. Locate Profile Folder and click on Open Folder button. Enter about:support in the address bar. Launch Firefox in the working platform/version setup. You can also manually copy the profile folder somewhere else to backup it. Make backup of your Firefox profile using MozBackup. But before you create a new profile, you can make an attempt to use the same profile in the following manner: The problem with sharing profile with different versions of Firefox or different platforms is that browsing history is saved in a different manner and trying to load them on other setup might indeed cause some problems. At this point you can click on “Exit” and dismiss this message or create a new profile. It suggests that you create a new profile and won’t let you proceed with the same existing profile. 
The message goes on to explain that using an older version of Firefox for the same profile might corrupt the bookmarks, browsing history and other files already saved in that profile.
#Mozilla firefox for mac old version windows#
When you are trying to share the same Firefox profile across different platforms (such as Windows or Linux) or across different versions of Firefox, you will see a warning – “ You’ve launched an older version of Firefox“.
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