Note that you could also make it a bookmarklet which requires no permissions and only accesses the current tab when the user clicks it. Would be nice for trying out how it looks, given how little it changes I was expecting this would be a little bookmarklet and was a bit disappointed I had to add an extension to my browser for trying the look.
A bookmarklet would have to be clicked every time you open a new wikipedia page. I think it would be more productive to just fix the main permission issue (can view entire browsing history - author says in a comment they'll be fixing it). Chrome also lets you keep the extension inactive - you can easily activate it on-demand from the toolbar. If you do that on a minimal-permission extension, you have the equivalent of a bookmarklet.
