Rated 1 out of 5 stars

I think this extension is useless, because you can set colors in Firefox Options, and these is for all sites in the same way.
It looks very horrible!

A very better extension for this is NoSquint and it even permits per-site settings!

This review is for a previous version of the add-on (0.1.5.1-signed.1-signed). 

So I offered you to try my extension in a support forum and you trash it and give it a 1-star rating? Gee, thanks. If the Firefox Options panel actually *worked* for changing backgrounds of all websites then I wouldn't have built this extension... duh.

And for future reference, read the Review Guidelines, and particularly the section about what the star ratings mean:
https://addons.mozilla.org/en-US/firefox/pages/review_guide