As the title says. Is anyone else having the same problem and is there a way to fix or is it Google's problem? But using Chrome it is total fine.
So I used Inspect Element and found these addresses.
The Google logo's address: https://www.google.com/images/nav_logo156_hr.png
The youtube stylesheet's address: http://s.ytimg.com/yts/cssbin/www-core-vflQE6NzM.css
Using Chrome I can visit these addresses, but Firefox says "File not found".