Rendering issues in Firefox 53 on Windows 7

[eboCode]

Hi Wentin,

I noticed very similar issues to the ones ionelmc posted (#22) just over two years ago in this list for FF 35.0.1: "Bad rendering in firefox 35.0.1 #22." While ionelmc said he was using win 8.1, I believe I'm currently on an Enterprise version of win 7. I'll attach a screenshot here using your layout as a render:

Earlier today I was first introduced to some of your great work by watching the Mustache CSS video you have on Youtube shown in an article on The dot Post:
Make CSS your secret super drawing tool

When I looked at underline.js earlier today on Firefox 53 for Mac OS X (El Capitan, [version 10.11]), it looked really great! I'm hopeful that a lot of this cross-browser stuff will subside, and am a bit encouraged by Microsoft withdrawing support for their older versions of IE recently.

Anyways, keep up the great work!

[tomByrer]

Same gaps issue on Fx55 on Win10.