I use Firefox with Temporary Containers. Each tab is a brand new context automatically. Tabs don't talk to each other, each of them is separate - although, if y

I use Firefox with Temporary Containers. Each tab is a brand new context automatically. Tabs don't talk to each other, each of them is separate - although, if you want, you can open a new tab in the same context, and even make permanent contexts. Closed tabs' contexts get purged after some minutes.