Firefox development edition font bug

Because firefox launched a special development browser i’m using this now. The wierd thing is that a font bug is showing. Is there any fix for this?

Browser: Firefox developer edition 54.0a2 (2017-03-10) (64-bit)
OS: MacOS 10.12.3
Drone: Latest

Have you confirmed this isn’t a font rendering bug in Firefox? There are no rendering issues with Chrome or Safari that I’m aware of. If you are able to determine there is a rendering bug I recommend sending a pull request to