The year is 2099, Google ingeniously enables civilization to abruptly be reclassified as Type 2 on the Kardashev scale as they enable everyone to suddenly have the ability to automatically close inactive tabs in Chrome after N days

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Cheers; yeah, would be great to be able to do it without extensions 

Am using Firefox on mobile predominantly for this reason :)

Chrome doesn’t have a built-in feature to automatically close inactive tabs, but you can use extensions to achieve this. In contrast, Firefox has this capability built-in, allowing users to automatically close inactive tabs based on specific time intervals like daily, weekly, or monthly.

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mm how chrome manages inactive tabs, firefox can close them, (every day, week, month..)