How to fix view-source font problem in firefox

Question

when i go to the any page view-source in Mozilla Firefox browser i have problem that you can see in screenshot... codes font in view-source of Mozilla Firefox browser are like that

and that's where the problem come from, when i change '-moz-fixed' font it will solve the problem but i always have to do this :(

here in this picture you can see what i am talking about...

Answer 1

apparently it was firefox bug and it fixed by their update updating because i didn't change any things and no longer have this issue

here you can see it's working fine