I'll add it to the whitelist myself so you can submit this as a report, thanks for spotting that.
Short answer as to why this happens is that I use utopian.io as my SC2 callback URL and because of that I had to enable the extension on utopian.io. I forgot that my HTML insertions and custom CSS could break that!
I'll get around to fixing that, thanks!
RE: Utopian Rocks - the Browser Extension is here!