I like how everything is designed based on view height and stuff, but I think the font size on mobile devices often actually get's a bit too small:

One can read it on a mobile device, because you are near it, but selecting text is not easy and one is just accustomed to a larger text size.
Also e.g. it switches the text size when the Firefox for Android's own title bar (i.e. the one where the address bar etc. is shown) is hidden automatically when one is scrolling. This is also not too bad, but not really nice. 😉
I like how everything is designed based on view height and stuff, but I think the font size on mobile devices often actually get's a bit too small:
One can read it on a mobile device, because you are near it, but selecting text is not easy and one is just accustomed to a larger text size.
Also e.g. it switches the text size when the Firefox for Android's own title bar (i.e. the one where the address bar etc. is shown) is hidden automatically when one is scrolling. This is also not too bad, but not really nice. 😉