Firefox Issues

[Lobain]

Recently, my Firefox stopped displaying videos, it would just show a black or white screen. Now the problem is this. When I run Firefox, it doesn't launch properly so I have to go into my processes and end the process "firefox.exe". After that, when I run it again, it just doesn't load pages at all. Then the third time I run it, it finally works for a bit but doesn't load videos still, then eventually just doesn't loading anything. Is anyone else having this problem, or knows how to fix it?