What are your favourite add-ons/extensions on Firefox?

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Usability
Kill Sticky: Kill off the annoying floating things blocking the website you're trying to see.
Tranquility Reader: Like native "reader view" but compatible with other addons and more options.
Scroll Zoom: Zoom web pages with the left or right mouse button and the scroll wheel.
Image / Video
Image Max URL: Finds larger/original versions of images (supporting 8800+ websites), including a powerful image popup feature
Invert Image: The add-on inverts color of an image or color of any part of a page. Changes white color to black, for comfortable night time reading.
Save webP as PNG or JPEG: Convert any image (WebP, AVIF, etc.) to PNG or JPEG (with choice of quality) for downloading.
TinEye Reverse Image Search: Click on any image on the web to search for it on TinEye.
Video Speed Controller: Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
Enhancer for YouTube™: Take control of YouTube and boost your user experience!
Tools
EPUBReader: Read ePub files right in Firefox. No additional software needed!
WebStickies: (Persistent) Sticky notes for the Internet
RSS
RSSHub Radar: RSSHub Radar is a spin-off of RSSHub that helps you quickly discover and subscribe to RSS and RSSHub for your current site.
RSSPreview: Preview RSS feeds in-browser
Customization
Stylus: Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager.
Tampermonkey: Tampermonkey is the world's most popular userscript manager.
Advanced
Request Control: An extension for controlling requests. See also Redirector, not as powerful, but much more user friendly.
Modify Header Value (HTTP Headers): Add, modify or remove a header for any request on desired domains. I use this one to force sites to load only the image when opening images in new tabs.
Cookie AutoDelete: Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Keep the ones you trust (forever/until restart) while deleting the rest. Containers Supported
uBlock Origin: Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.
uMatrix: EDIT-WARNING: as pointed by @sovietknuckles@hexbear.net, uMatrix it's not longer maintained since 2021 Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
- Use ViolentMonkey it's open source and actively developed for Firefox, while TamperMonkey is originally developed for chrome
  
  Thanks for the advice!
  Sadly, I knew about that too late and I'm a heavy user of Tampermonkey. It would be painful to migrate now :(.
- Thanks for adding the links, you the mvp
- What's the difference between uBlock origin and uMatrix?
  
  I cannot answer that properly, I don't really understand them enough. I will add some copy-pasted answer on bottom. But, from a user perspective my experience is:
  uBlock origin: blocks a lot of (but not all) unwanted stuff without breaking (almost) anything. When some page does not work, tt's very uncommon that uBlock origin is the cause.
  uMatrix: blocks (almost) all unwanted stuff, but it breaks many pages by default. If a page does not work, the first thing I look at is uMatrix.
  NoScript (and similar): It's been some time since I used it (so those who are more familiar, please correct me if I'm wrong). What I remember is that it was even more strict than uMatrix. Something like uMatrix allows by default everything from the same domain as the URL but NoScript does not.
  So I would recommend uBlock origin always and uMatrix only if you are ok with some micro-management page-by-page.
  Here it's a copy-paste of the answer from the first link in the google search ublock umatrix differences:
  Chris's Wiki :: blog/web/UBlockOriginAndUMatrix
  While it's true that uMatrix and uBlock Origin have overlapping functionality (and are written by the same person), they have different purposes and focuses. uBlock Origin's focus is blocking ads and other undesired things as an out of the box experience with little configuration needed. uMatrix's focus is on exerting tight and highly specific control over what resources a page is allowed to load and use, including Javascript and cookies (and requires a lot of configuration).
  
  People still use uMatrix? gorhill archived the uMatrix repo/stopped maintaining it in 2021.
  
  Oh, I had forgotten, I'm going to add a warning to my comment thanks for noticing!
  When I was aware of that, I expected it to break at some point. But I didn't find a proper replacement... and it still seems to be working fine.
- Thank you for this list! I found several add-ons I never knew I was missing
- Thanks! These seem useful. I've only used a couple add-ons from your list. Time to try them out now.
  Your are awesome for adding links too!

163 comments