This is a MUST add on, it is so comfortable for my eyes, I can't believe why I did not know it. 5 star. There is only one problem, that it changes my black theme of firefox (on restart of firefox) to white. Again I have to make it black, otherwise it is the best add on.

Awesome, but as others pointed out, give it some focus on performance and this will be top add-on

Unbelievable addon！I have only two suggestions
1. the clicked urls（i.e a:visited）could be different-colored from normal urls（i.e a:link）, it really helps .
2. large white images could also burn our eyes , so img could be added an opacity value to make it not so bright , until the mouse hovers on it then set the opacity 1.

good

It's absurd how good this add-on is, it lets you dynamically adjust the look of sites and does a great job. It's basically "one theme to rule them all".

Amazing work devs!!

very good.