(Tweaked) Verdana FTW.
I liked proportional fonts for reading code - several of my favorite programming books used proportional fonts for code examples - so when Verdana was released in 1996 I switched to using it in my IDEs. I've had 27 years of pleasantly ergonomic coding - it has a high x-height, different 0/O, I/l/1, and impeccable hinting and kerning. ❤️❤️❤️
Doubt it. This happens a lot for me too on a boring single-screen S23.
I assumed it was crappy devs not testing on FF anymore & have lived with it (since it's a pain to debug css/js problems on mobile).
Next time I see it happening I'll reproduce on desktop FF with responsive emulation & report the bug.