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I just use this one https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/ https://addons.mozilla.org/en-US/firefox/addon/multi-account... and

I just use this one https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/ https://addons.mozilla.org/en-US/firefox/addon/multi-account... and Firefox Nightly

TonyTrapp 2y ago
That's it, the icon comes from Multi-Account Containers.