I am experiencing a weird scaling issue on one of my monitors with Firefox. The whole firefox window looks as if it's scaled to high resolution mode. Not just zoom of the content, but the whole window, including the title, toolbars, etc. Note that only happens on ONE monitor (I've tried this on total 6 monitors now), and it happens only on one Firefox Profile. If I use a new profile, the issue is gone. However, if I copy the profile folder to the newly created profile, the issue comes back. Here is a screenshot of the two windows opened at the same time on the same screen. Right window is normal, and the left window is the scaled up version. https://i.imgur.com/ikq00DA.png I don't want to re-create my entire profile if I don't have to. Does anyone know what kind of setting/feature did this and how can I revert it? Since it does not happen on a different profile, and is replicable by copying the profile settings, it must be some kind of a firefox setting somewhere.