Enables dark reader mode for local PDFs and documents.You can create a whitelist/blacklist of sites, enable dark mode automatically at startup, apply classic themes on specific websites, etc. One cool feature is that you can turn on dark mode for local PDFs that you can open with Firefox browser. Whether you read articles or edit documents on Google Docs, you can get a dark reading environment for anything. Owl is another dark reader Firefox add-on that you can use to apply dark mode in Firefox.
Read: How to Enable Dark Mode on WhatsApp Web 5. On the other hand, it is possible to customize each dark mode type according to your requirements. However, if you want to apply the same dark mode instead of a different one, you can do that from the Preferences. It offers some specialized dark mode for some preset websites like YouTube, Facebook, Reddit, etc. For example, you can schedule dark reader mode in Firefox so that you can save some time, quickly turn on/off the dark mode, etc. Like most of the other Firefox dark reader add-ons on this list, it offers a few options to manage everything from your end.