That Multi-Account Containers extension is awesome. My primary use case for Firefox container tabs is that I have separate Google accounts for personal and work

That Multi-Account Containers extension is awesome. My primary use case for Firefox container tabs is that I have separate Google accounts for personal and work stuff. With Multi-Account Containers, I can have Gmail and YouTube in Personal tabs and Google Calendar and Docs in Work tabs. You can also use Firefox's about:profiles page can to open and manage different profiles in different windows in one running instance of Firefox.