I love Firefox. My school is stupid and sliced my laptops hard drive into two partitions of Windows XP, one for school and one for home. They force the home side's background to be pink so a teacher can tell if you're on the home side at school (which you aren't supposed to for the slow people), and they disable every way of changing it.
On Firefox, if I'm looking at an image directly and it's resized smaller because it's really huge or I made the window small, I can set it as my desktop background and thus change it from pink :D