Would something like Firefox's containers(?) help you for these sites? There's a way to leave a single tab signed in without having it leak the fact that you're

Would something like Firefox's containers(?) help you for these sites? There's a way to leave a single tab signed in without having it leak the fact that you're logged in to your other browser tabs, rather than logging in each time you use the site in a new private session. It's even possible to log in to the same site on multiple accounts with this feature.