I used to prefer that setting in Firefox, because I preferred to keep images pixel-accurate rather than scaling them, and I just wanted the text bigger for read

I used to prefer that setting in Firefox, because I preferred to keep images pixel-accurate rather than scaling them, and I just wanted the text bigger for readability. I'd propagated that setting forward from Firefox install to Firefox install for roughly 15 years, since before the 16:9 display era. Then I got higher-resolution 4k screens, which simultaneously meant that scaling looked better, and that scaling images (not just text) was necessary. (I also now use `devPixelsPerPx=-1` to scale everything up by default to an appropriate DPI for the display.)