Well, ... Rated 2 out of 5 stars

... it darkens some of Twitter's page zones, but not all (FF48.0.2, OSX.8.5). At the moment, that's not good enough.

Doesnt work Rated 1 out of 5 stars

Doesnt work

Wonderful! Rated 5 out of 5 stars

I just installed this addon because my eyes hurt from the glare of white backgrounds. It installed flawlessly and I'm highly pleased.

Thank you very much for your time and effort with this,Sanju. Much appreciated!