If Firefox continues to work, does that mean that it can be used as a workaround, potentially? I guess it depends on how the DRM works, if something like running it in a Firefox tab would work.

And surely blocking Firefox would be a bad move for Google since that would clearly be using monopolistic power in one market to gain advantage in another, right?

Nah. The need to regularly change passwords is unnecessary. If you use a sufficiently long password, unique passwords for every site, and 2FA/MFA for “important” logins, then you’re good.

Businesses requiring their staff to regularly cycle passwords is outdated and makes their systems less resilient, since it opens more angles for social engineering attacks or password security carelessness.