Unbelievable. The author has dissected YouTube.

The number of features is staggering. There is something for everyone—too much to list in this comment; you have to try it yourself.
Amazingly, every option is explained via tooltips, so you know what to expect. The UI has a clean and elegant style, something that browser addons often fail to achieve. After finalizing your settings, you can export them and easily apply them to any device and browser.

I was using YouTube Enhancer before, which had a fraction of the settings that this extension offers, and some of them didn't even work!
Frankly, the former looks like a joke when put next to this one.

These should be the official YouTube settings, and the author should be employed by Google, collecting big paychecks. This addon simply feels like a part of YouTube.

This absolutely smashes unhook. I found it searching for "make thumbnails smaller" but the more I tinker with it the more features I find that I didn't know I wanted. Even the UI and tooltips are first class.

Working as expected but too complicated for me. Still use this instead of Enhancer for Youtube on Firefox.

Many settings do not work now (worked week ago) - example - dimming watched videos on sidebar, full video titles on sidebar

Lots of options, nice work!

Very powerful tool. Not for dummies, yet.

This is amazing. Would give 5 stars, just need ability to resize Default player view, I want to make it smaller.

FANTASTIC PROGRAM. Seriously. I only got it to -ensure- that subtitles stay in the dang lower bottom where they BELONG.

But the quick controls using the mouse (I have enabled in full-screen), as well as the ability to alter the time it takes for the controls to disappear, and having them not appear with any mouse movement but when you actually point in those regions.. it is fantastic. It makes youtube browsing a blast!

Great extension. Have switched from 'Enhancer for YouTube'. Thanks to the developer.

This is the best add-on for YouTube customization!
Especially the sound settings and Clean Player!
Why so few users?

Just recently, I had a problem with my YouTube thumbnails getting too big, and thanks to this extension, I was able to get them back to normal. It works perfectly with no conflicts with other extensions. Thank you for making this!

The best youtube extension that I have used, thank you for making it! I do have one issue however, Is it possible to get rid of the empty space in the first row of thumbnails? I have just two (sometimes three) thumbnails and then black space while the other rows show the correct amount. I have custom rich grid layout enabled with 6 items per row.

Superb addon but it lacks some features:
- unround corners of player and thumbnails
- semitransparent gray overlay with text "watched" for watched videos' thumbnails (like in AdashimaaT­ube userstyle) because dimming hurts
- turn on/off codecs av1 vp9 avc (like in Improve YouTube)
- prefer 30fps video track over 60fps, sdr over hdr
- apply audio processing changes only to current video and return to user-defined defaults in next video
- restore old animated thumbnail previews when inline playback is disabled (like in Restore animated thumbnail previews script)
- currently active audio processing options in Video Playback Info
- mirror horizontally in video filters

Only feature I wanted was to display more vid thumbnails as Youtube has reduced them to 3. Youtube is so STUPID!! This does not overcome the default formatting limiting the display. After install and several page refreshes 6 place holders display in gray for a split second....then loads the restricted giant 3.
Update: I believe I did enable the "Custom Rich Grid Layout"....can't say with 100% certainty. But I can say I installed a different add on, selected 6 wide for my grid and refreshed Youtube and it worked 1st time. No extra steps, no hidden toggles, etc. You may have a great add on....but spending hours or days trying different "features" to achieve my needed result is not time I'm willing to spend. If enabling another toggle is required you should have them linked or noted.