Rendering issue in Firefox

[Apromixately]

I'm pretty sure this used to work but I haven't been on the site in a while. I am getting this:

[freddyb]

works for me in firefox nightly.

[Apromixately]

Tried again today:

Not as bad, just minor rendering issues with the subscript.

[Apromixately]

If I make the window really narrow at some point it scales down and looks better: