FireFox need to improve their integrations and offerings to be on par with Chrome at this stage. It, at times can be such a bainful browser to use and honestly I don't think a VPN is the next step. Improved account handling & switching would be huge.

I'm not sure what you mean by account handling, but you can long-press the new tab, and you can choose a different profile (for example "work") which has a differently-colored tab. It's pretty great.