I use Firefox multi-account containers[1] extensively, it's honestly the primary reason I use Firefox these days. The big win for me is that I _hate_ having to use the Google account switcher, so I basically set up a container for each Gmail account (work, personal, old email, etc).
The nice bonus feature is you can have certain sites default to containers. I had a paid YouTube account for a while, for example, so having any YouTube link open in my personal account was nice for not getting hit with ads on initial click due to my default Gmail not being the right one.
There's also a plugin[2] that will make any new tab default to whatever the first tab listed is. Really great for if you want to have a whole browser window dedicated to one container.
The nice bonus feature is you can have certain sites default to containers. I had a paid YouTube account for a while, for example, so having any YouTube link open in my personal account was nice for not getting hit with ads on initial click due to my default Gmail not being the right one.
There's also a plugin[2] that will make any new tab default to whatever the first tab listed is. Really great for if you want to have a whole browser window dedicated to one container.
[1] https://addons.mozilla.org/en-US/firefox/addon/multi-account...
[2] https://addons.mozilla.org/en-US/firefox/addon/sticky-window...