Hi David,
Thanks for sending the workaround.
I'm posting it here so other user can try it too .
Text rendering issue in Firefox (Mac) is fixed by adding a value to "Z" in translate.
So if you translate property looks something like this = X 2px, Y 10px, Z 0px. Just give the Z a value like 1 or 2 and its fixed.
I hope this helps !
Thanks
Sukhbir