I'm using the Simple Tab Groups plugin [0]; you can have two separate windows, each with a different group selected, and you can associate a group with a contai

I'm using the Simple Tab Groups plugin [0]; you can have two separate windows, each with a different group selected, and you can associate a group with a container. Alternatively, I prefer having only one window, and switch between the groups as needed. [0] https://addons.mozilla.org/en-GB/firefox/addon/simple-tab-groups/ https://addons.mozilla.org/en-GB/firefox/addon/simple-tab-gr...