Rated 5 out of 5 stars

Από τον/την maverick στις Οκτ. 3, 2017 · μόνιμος σύνδεσμος

This is one of the great FF addons. Hope it finds a way to the new addons system. If it doesn't maybe this can be used as an alternative:

https://addons.mozilla.org/pt-PT/firefox/addon/tab-session-manager/