Works fine for me, try a different font size?
I’m using a 22’ LCD monitor at 16 font size and Firefox, no problem here.
Check you screen size parameter.
Using a MacBook Pro, and Safari.
Even if I reduce the screen size to the point where I have to put on my mag-eyes to read it, it still goes off my 17” screen, unfortunately.
And, I won’t switch browsers. I love Safari.