Please keep updated. Rated 2 out of 5 stars
I use Firefox 14 alpha. I can't stand the nearly black background but your addon is incompatible with my build.This review is for a previous version of the add-on (1.0).
It mostly is compatible. AMO should let you ignore the stated compatibility and try to install anyway (but I've bumped it up to 14.0a1 now).
The "mostly" is because of Bug 717143. Firefox's "resize image to fit the screen" now ignores the margins, and so ends up with the wrong image size. I've fixed that in 2.0, but I'm sitting on the update because I've seen Firefox crash with it when loading many images at once.
I'm working on trying to find some reliable steps to reproduce that crash, which will give me some hope of reporting a bug on it or avoiding it.