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During many years using Firefox and forks and I've realized that sometimes Firefox gets slow and sometimes unresponsive.

Workaround, going to about:memory, and clicking on "Measure" button you can see how much memory is in use. However some of this memory should be free (related to closed tabs and ghosts)

At the moment this issue at least is active on Waterfox and i am freeing memory manually, but it is annoying to feel the lack of performance and then time consuming to do the steps.

How can be executed the function "Minimize Memory usage"? Can the execution of this function be scheduled?

Though described issue maybe is not impacting on modern and official firefox, the question can apply to any firefox version.

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Firefox currently offers automatic unloading of "low priority" tabs when system memory is low. You can see this by typing about:unloads. This feature can be toggled via browser.tabs.unloadOnLowMemory on the about:config page.

You can read more about it here and here

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    about:unloads is the correct form. browser.tabs.unloadOnLowMemory is set to false by default, so I have changed that.
    – cipricus
    Nov 8, 2022 at 12:12
  • I am seeing that it is a new feature starting with Firefox 93. Nov 9, 2022 at 13:06
  • @cipricus Thanks for the correction. I've fixed that
    – tst
    Nov 13, 2022 at 18:47

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