Gmail verification code (Google authenticator)

So, ever since I switched from SMS-verfication to the new google authenticator app, XN asks me for a new code every single time I open firefox.

With the SMS system it used to pop up only every couple of days or so, which was still barely tolerable, but now I just about had it.

Am I doing something wrong, or is there anything I can do? Would switching to Chrome help?

Thanks for the help :)