• Scroll Anywhere - hold right click to scroll, for ergonomics.
• BlockTube - one click and spammy clickbait channels are blocked forever
• Dark Reader - beautiful auto styling for dark mode normal web pages.
• EmailThis - sometimes you just want to read an article in its cleanest form on your other device without being signed in to both devices or whatever firefox makes you do. I just use my free temp email from https://emaildrop.io

honorable mentions to convert articles on annoying sites to nicer layout or TTS sound file:

• https://outline.com/
• https://PlayThis.link/