VersionX Allows old extensions to install.
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VersionX Description

With each update, Firefox gets better and better. Unfortunately, extensions for Firefox often stagnate. Sometimes the extensions become unusable. But more likely, they're just not officially supported in the latest version of Firefox. Even if they are still functional, Firefox will not allow you to install them. VersionX turns on the switches inside Firefox that will let any extension install, no matter the version.

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