LibreJS blocks non-free non-trivial JavaScript while allowing free or trivial JavaScript. The Firefox Add-on page allows for an easy one-click install in Mozilla Firefox.
These programs will enable you to watch YouTube videos in free formats without using proprietary JavaScript.
Install totem-mozplugin-vegas
youtube-dl can be used from the command line to download and watch the videos. Use --format=45 or --format=43 to specify WebM format.
Install FlashVideoReplacer:
YouTube now transcodes all uploaded videos into WebM, but the viewer must still use a flash video replacer to avoid proprietary JavaScript.
It is best to choose no advertising for your video, because that can also have the effect of making it require Flash to view in some situations.
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