A proposito de iste extension

Does only one task, closes other similar tabs (tabs with same host name and protocol).

Right click a tab to see the menu.

Also shows tab count.

Requires minimum permission

More info

Another addon: Close Similar Tabs is to close all tabs from same host
Why need two addons? it's to allow both menu items to show at top level, so you don't have to go to sub-menu.

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