Firefox Support Forum

If I assign a certain site to a container and close and reopen Firefox, the site still loads but is not assigned to the container anymore. It only does when I set a site to always open in a specific container. Is it supposed work like this, or can I change this somehow? It is fairly inconvinient if I have to reassign every site to the right container every time I start Firefox. Thanks in advance.

i want to play multiple(2) youtube videos at the same time in different tabs inside the same firefox window , what about:config commands do i need?

example listen to one tab in the background while watching another in the foreground tab, in the same firefox window.

second thing: is there a about:config or add-on that gives a mute/unmute for each individual tab located inside the tab header of each tab like a speaker button mute or unmute for individual tabs?