Comment by hundchenkatze

None of these would be an issue...

From the article your "password" is a:

     short-lived one-time-use tokens delivered over a secure channel that they control

So, your session times out, log in again by requesting a new one-time-use token delivered over the channel of your choosing.

What to log in using a different browser, it's the same as before, get a new token.

You get the idea...