Was even zoeken, maar hopelijk is dit de oplossing:
Funky colors of images
Firefox's color management is somehow buggy, so depending on your hardware and drivers, you may encounter images with apparently wrong colours. Before you complain to your friends about the poor quality of their photos you have seen on Facebook, try the following (see the forum thread for more)
1. Enter about:config into your address bar (and accept the warning that follows)
2. Change the value of the gfx.color_management.mode preference to 0
3. Restart Firefox
Van
https://wiki.archlinux.org/index.php/Firefox#Funky_colors_of_images