To use these add-ons, you'll need to download Firefox.

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Iceggiren i Simple Tab Groups

Simple Tab Groups sɣur Drive4ik

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Icegger-it Aseqdac Firefox 16412302
sɣur Aseqdac Firefox 16412302, há 5 anos
That helps: (by rk)
EDIT. For those having similar issues. I think the trick is to open about:config and set closeWindowWithLastTab to false.