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Have you given any thoughts to Content Security Policy potentially breaking this library? I'm doing what I can at Moz with the expanded principal but until that is addressed there might be some issues on certain sites and potentially more.
See also:
Re: @Marti:
I have actually not though about that.
After I read through the Content Security Policy I noticed a part about inline JavaScript code, which will very much break any script that injects code into the page (including this library); it was also what was discussed in the GM issue you referred to.