Yeah, that browser zoom. And I too used / use Firefox. I'm not saying these kind of sites are common, but nevertheless I've encountered them occasionally. Back then, the most pragmatic workaround was to use desktop zooming of Xfce.
My intention on the previous comment was simply to give some examples of desktop zooming that go beyond the typical accessibility viewpoint (e.g. vision impairment).
Ha, for sure I missed the other comment...