My Firefox plugin in Tobii Studio is missing. What can I do?

Tobii Pro Studio Tobii Pro
The Firefox plugin is required for web recordings with Firefox in Tobii Studio.
If, for some reason, the Firefox plugin for Tobii Studio is missing, please have a look at the following FAQ on how to fully uninstall and reinstall Tobii Studio.
Reinstalling Tobii Studio should also install the Firefox plugin.
A list of compatible versions of Firefox can be found in Tobii Studio -> Tools -> Settings -> Recording. Always make sure to use one of the compatible versions listed.