The browser periodically reads /proc/meminfo and checks MemTotal and MemAvailable entries there. Once MemAvailable drops less than browser.low_commit_space_threshold_percent (5% by default) of MemTotal or MemAvailable falls below browser.low_commit_space_threshold_mb (200 MiB by default), the tab unloading mechanism is notified to do its job
go to settings > devices > keyboard
look for the keyboard shortcut for "Switch windows"
set this to the shortcut Alt+Tab (this will overwrite the old shortcut)
If you now press Alt+Tab you will be able to directly select all open windows without grouping into the different apps.
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