http://www.chromeactions.com/ (Chrome, Firefox, Opera) Seriously, I don't know how anyone can use YT without it, half these "features" should be part of YT by default, which of course Google won't do because they prefer to screw everyone over with each new refresh instead
Volume Control
Auto HD
Cinema & Backlight
Customize Comments
Day & Night Themes
Video snapshots
Hide In-video Ads
Auto Wide
Stop Autoplay
Auto Replay
Hide Player Controls
Align to Center
Hide Page Elements
Ratings preview
Enlarge Thumbnails
Spoiler:
It has been updated a few times since then as well
Magic Actions is one of the best Chrome extensions available The Auto HD even fixed (for good) my problem with 720/1080p videos not loading correctly. But the other features are nice too, it really enhances the messy tube immensely.
It's kind of a long shot, but has anyone experienced problems lately with auto HD not working in many Chrome extensions? It's broken for me both in Youtube Options and Magic Actions, reinstalling Chrome doesn't help. I've even reinstalled Windows since this started happening and the issue is still there. The only extension that works is HDResizeTube.
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The Auto HD even fixed (for good) my problem with 720/1080p videos not loading correctly. But the other features are nice too, it really enhances the messy tube immensely. 
