Firefox Pdf Reader Dark Mode. Everything in firefox including the title bar toolbars and menus will turn black or a dark shade of gray with the dark theme. If you want a simple dark mode for your firefox browser dark mode is one of the simplest extensions for you.
One thing to clarify using a dark mode theme in firefox doesn t change everything to dark mode that uses the css prefers color scheme. This built in pdf viewer is enabled by default. Everything in firefox including the title bar toolbars and menus will turn black or a dark shade of gray with the dark theme.
Click on the addons menu entry.
Firefox includes a built in pdf viewer that allows you to view almost all pdf files found on the web without an external application exceptions to this are pdf files with a mime type incorrectly set. On the menu that shows up click the moon shaped night mode icon the pdf should render with a dark background instantly. The light theme uses lighter grays. Firefox s built in pdf viewer.
