I have looked at three Texture entries in the current IF Comp, (+=x, And You May Find Yourself, Tohu Wa Bohu), and I see the same issue in all three.
The text inside the buttons appears really tiny, like a 2-point font. On my 1080p monitor, it’s almost illegible.
I’m using Firefox 63, and I don’t know of any weird settings that would cause this. (And I can’t think of any other weird font size behavior in my normal browsing.)
Here’s a sample: