Extension Account Pinning

[shrugs]

An idea: I currently separate my various web3 presences by chrome profiles (and firefox containers), meaning i can quickly cmd-tab to switch between contexts. This worked quite well when every presence i had was in a separate metamask extension instance, but after switching to frame I have to cmd-tab to my new profile and then select the specific account i'm acting as in frame (and if i don't do that, sites i'm talking to will see the wrong me).

so obviously this is a doxxing/linking issue (nbd in my case, this is like work vs personal accounts) but primarily a UX one as well.

it think it'd be really neat to be able to choose a "default" account within the browser extension such that the browser extension always shows that account to the connected sites, proposing txs through frame as normal.

cc @floating