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Of course, else it would be unmanageable.

https://addons.mozilla.org/en-US/firefox/addon/auto-tab-disc...

I tell it to never discard certain tabs, like gmail or snack or calendar. Also in some situations it's very convenient to ask it to discard tabs in all other windows, or all tabs but the current one. Otherwise it just discards tabs after some time of inactivity.

It integrates with TST and can operate in terms of subtrees.

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Crazy that I haven't heard of this one before. Just installed it and after forcibly putting all the tabs in all my windows to sleep my machine's memory usage dropped from 60% to 30%.

Sidebary has this functionality as well. On top of that it has a setting that allows you to have it auto-unload the parent and its child tabs whenever you collapse the group. I l have a few resource hog sites I use frequently that I keep grouped so I can just collapse the group and get back my ram.

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