Good addon Rated 5 out of 5 stars
It's mysteriously simple but there some tips i would give to you to make this effect. Some other addons installed might damage this addon or probably changing modifications in about:config. Hoping for this addon to be protected from other addon's who's scripts might change its variable. But when i restart the settings of all addon it work fine.This review is for a previous version of the add-on (2.1-signed.1-signed).