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Cool idea, but wouldn't this make more sense as a Stylish theme?

Actually, Wikipedia even lets you upload your own custom css and javascript when you're logged in. http://en.wikipedia.org/wiki/Special:Preferences#preftab-1

This is a much better solution than downloading an extension.

Extensions get synced with Chrome; Stylish themes have to be backed up and applied, if you use another computer, format, etc.

Ideally, both options should be available.