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

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Iceggiren i Retainer

Retainer sɣur Roy Orbitson

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Icegger-it archon810
sɣur archon810, 3 jierren lyn
Does exactly what it says. I was able to customize the shortcut to Ctrl+Alt+T.
Found via https://github.com/mozilla/multi-account-containers/issues/462.
5 n yiceggiren