It appears that the AI-powered tab grouping of Firefox keeps this extension from being effective.
You need to turn off 'Use AI to suggest tabs and a name for tab groups' in Settings > General.

The extension discards tabs more than Tab Unloading, a function of Firefox and is more flexible.
I still needs it.

Edit: Options work perfectly now, it was problem on my end.

Useful for my potatoe, but the options do not take effect for me for some reason which would be super helpful otherwise. Thank you. Shall revise the review when I can get that working.

Good, but firefox now has built-in tab discard/unload feature, so in fact you don't need this anymore.

Demasiado buena, funciona perfecto.

It works very well and what I like most is that the add-on behavior is very customizable.

its like marvellous suspender for chromium browsers but works better in every single way (for me). I had a lot of time consuming issues with various suspender versions after the official one died and swapped to firefox a few months ago, this one JUST WORKS! big fan.

I can now play while having 70+ tabs, very simple, nice, useful, thanks!!!

Az újabb Firefox nem kezeli jól a memóriát és elképesztően sokat zabál (belőle) így aki úgy használja amiben ez a böngésző eredetileg a legjobb volt, tehát sok ablak = lap = fül = tab akkor ez neki való mert az inaktívak nem használnak memóriát és így végre újra a régi az élmény.