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These are frontend and backend libraries, respectively. They were used in all of our software because, simply put, Joomla 3 was woefully behind the times. Joomla 4 used a lot of the ideas we have introduced in FOF, and finally moved to an up-to-date version of Bootstrap, rendering the purpose of these extensions moot. Therefore, we discontinued them in 2021 without a replacement.

Back in 2021 and 2022, in the Joomla 3 to 4 migration heyday, we did have instructions to uninstall them from your Joomla 3.10 or 4.0 site. These instructions will no longer work. At this point these extensions are 4 years, 2 major Joomla versions, and 4 PHP versions out of date. Their uninstallation script will simply not run anymore.

You can of course remove the update site and delete the media/fef and libraries/fof30 directories, but you will be left with junk entries in the #__extensions table.

Alternatively, you can subscribe to Akeeba Onthos, our extension to manage extensions beyond what Joomla itself can do. With Onthos you can find these extensions, select them, and click on Danger Zone, Forced Uninstall to completely remove them from your site even though Joomla itself can't. Onthos works with any extension. I did not write it to remove leftovers of our extensions, I wrote it because I had leftovers from third party extensions on my sites and I wanted to remove them without having to take a lengthy, complicated, and error-prone manual procedure for each one of them.