How are you using and configuring Firefox Multi-Account Containers?

I’m also trying to figure out if there’s any benefit here. I really like the idea of MACs, but it feels a bit like they might not be super useful anymore, they increase my surface area for attacks and potentially give Mozilla permission to see my data in a way they otherwise wouldn’t. Not sure if any of those are valid concerns but I haven’t installed them for the moment, I just use the default containers in Firefox browser.