I previously had another plugin that worked like a charm. This one somehow works, but a lot of memory is still being leaked so I have to restart browser often. Didn't have to do it with a previous one. I'm not sure, maybe a new plugin model doesn't allow to do it so good as before, but still, the effect is currently far from perfect.

WOW! Installed UnloadTabs, opened Task Manager and with just one click on "Unload Other Tabs," Firefox Memory usage dropped by a full 50%! Opened the All Tabs Helper extension and confirmed that ALL TABS other than the current tab were grayed out. This is a FABULOUS tool -- thank you NiklasG!

This really works. Would be better still if it could prevent tabs from loading when opening a lot of tabs at once from a bookmark folder, or unload them each immediately when they load.

Good!
Can you add auto unload for xx minutes?
Thanks! :)

Seems to be working as described. :) Thank you.

So I tried the add on because of the ability to prevent unloaded tabs to load, I understand that there is no APIs yet, but it does not works as I expected. May I suggest that you take a look at Tab Suspender addon? the way the developer implemented this functionality is way better in my opinion, sadly I can not use this addon due to incompatibilities with other, more crucial, extensions.

Lastly, event do some functions are working in underoptimal conditions, I would have rated it four stars if it was not because it lacks an, in my opinion, key feacture. It can't auto unload tabs.

Link: https://add0n.com/tab-suspender.html