Automatically close tab after X hours

[astromatt]

Automatically close tab after X hours unless it is pinned.

X could be a setting:

• 6 hours
• 12 hours (default)
• 24 hours
• week

[Jon]

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[igorlogius]

@astromatt  This might interest you

Auto Close Tabs – Get this Extension for 🦊 Firefox (en-US)

Here are the example settings to close all non container tabs with real URLs after they have not been accessed  for 6 hours.

Notes:

1. Dont forget the "," after the number in (1)  
2. Make sure (1) and (2) have the same line offset in each textarea
3. Dont forget to click the toolbar button after saving the closing rules
4. Pinned tabs are excluded by default 

Hope it helps.

[MozMike]

There is also Tab Wrangler that I have heard good things about https://addons.mozilla.org/en-US/firefox/addon/tabwrangler/