GREAT

Edit: Loading issues seem to have been resolved!

I'm also having issues with the latest update breaking page loading. Hoping this gets the dev's attention and will happily revise to 5 stars when resolved!

this extension solves a surprisingly hard problem surprisingly well. It just works.

Black out the EARTH. Thank you.

does it's job perfectly. firefox must include some addones in it by default and ask the user on installation a fresh copy whether or not you want to enable it

Works like a charm.

So far, every website I tried it on worked very well, and the customization available is very nice: color, contrast, eye-strain reducing sepia tinting, white- and blacklisting websites are all available.

I am very happy with the addon.