XEAL , 20 days ago I will just leave these here: https://addons.mozilla.org/en-US/firefox/addon/dustman https://addons.mozilla.org/en-US/firefox/addon/duplicate-tabs-closer
I will just leave these here:
https://addons.mozilla.org/en-US/firefox/addon/dustman
https://addons.mozilla.org/en-US/firefox/addon/duplicate-tabs-closer