I'm a little bit of a tab hoarder... And that results in all of my 32GB of RAM filling up all the time. Then I need to close the browser and open it again, to free up my RAM. My next planned step before knowing about this extension was to buy more RAM.

But this extension fixes the problem. All tabs that are not used just get their resources freed after some time. How this is not a standard feature in Firefox baffles me... So it goes without saying; This is a great extension!