It is obvious that having silos, or isolated brower sessions per tab is a good idea unless you are fine with being tracked about the web.
This solution for Firefox works well for me, as far as I can tell, and is relatively easy to use. It takes some time to setup and each website you visit belonging to an organization that you want to put into a specific container needs to be placed manually into that container (you can't seem to set a wildcard via the front-facing interface?).
But when done, you just surf and tabs open up naturally and all that you've asked to be isolated is: just as I'd want its functionality to behave.