Mozilla provides an official Addon to Firefox which enables you to open sites in special containers which should isolate site from one another. Firefox Multi-Account Containers
My current approach is to isolate the things that are private like email and stuff, and to isolate the untrusted stuff like Reddit, Twitter and so on. The rest is all container less at the moment.
A friend of mine is using an additional addon which is creating temporal containers for all new tabs. Temporary Containers
This is an addition and this addon needs permissions like “Access your data for all websites” and “Access browser tabs”.
So I am not so sure about this.
I do like that it forces you into using containers, and that it create a new one every time means that you aren’t logged in somewhere by accident.
So my question is, is someone using containers? what are your thoughts, are they a good idea, what approach would you recommend?