My choice for automatic CSS modification which works so well that some websites look much better with Dark Reader than with their default designs.

Has a performance toll on your computer though and occasionally you might encounter issues (I recommend learning the keyboard shortcut to quickly toggle a website), however considering the complexity of automatically transforming stylesheets of all websites it's really a remarkable job done by the Dark Reader contributors.

Un must, mes yeux vous remercie, tant de confort supplémentaire sur certains sites à fond blanc

I installed this add-on because it was a "recommended" extension. I've been using this DR for several months. Today, strangely, it stopped working. I closed and restarted Firefox and DR was gone. It simply disappeared from my list of installed add-ons. Why would it do this?