Is there a way to set up your internet browser (be it Chrome, Firefox, IE9), to automatically append the paramater "&hd=1" to any YouTube video URL?
Typing &hd=1 automatically sets it to 720p HD or 480p if 720p HD is not available. For some reason, it won't set it to 1080p - that still has to be done by selecting it in the pop-up menu on the video player itself. The other problem is, that people have to type &hd=1 for every video they navigate to, if they want the highest resolution and higher quality audio.
More aboutautomatically append youtube video urls
Which browser specifically are you wanting to do this in?
Mozilla Firefox - there is an app called Better YouTube which can do it, but it reports not being compatible with the latest version of Firefox.