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Are there any extensions for Firefox that can automatically hibernate or suspend browser tabs (when they haven't been used for a while?) I saw an extension like this a couple of years ago, but I can't remember its name now.

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4 Answers 4

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For Firefox >= 59, there is Auto Tab Discard.

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  • That did the trick!
    – Lyuboslav
    Mar 18, 2019 at 13:12
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Mozilla is already working on a fork of BarTab to make this a built-in feature. Bugzilla@Mozilla – Bug 675539 Automatically unload (stall/hibernate) longly unused tabs to free RAM

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  • What's the current status? Is it now built-in?
    – beppe9000
    May 23, 2017 at 16:27
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    It is found under about:config setting browser.tabs.unloadOnLowMemory: thewindowsclub.com/…
    – peterhil
    May 18, 2021 at 10:34
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Suspend background tabs: https://github.com/KamiIntelligence/Suspend-background-tabs

Suspend tab: https://addons.mozilla.org/en-US/firefox/addon/suspend-tab/

For a summary, you can check this reddit thread: https://www.reddit.com/r/firefox/comments/36qc63/which_tab_suspender/

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It appears that there is an extension called Tab Mix Plus that does this (by default). It automatically unloads tabs that haven't been used for a while (to free memory), and then allows them to be restored by clicking on them.

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  • Is there any UI to control this feature? I can't see any in Tab Mix Plus
    – Matthew Lock
    Jul 9, 2014 at 2:49

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