You may think it's okay, not making a big deal of it, as most things like this anonymize data before sending.
Guess what? Not only it does send to a web service the links for images you access, but it goes as far as managing it doesn't appear on your console and sends it over with HTTP.
This should be banned right now from the Chrome web store.
I don't know if the authors are aware how insanely invasive this is, but you have to know it.
I have only noticed when I was using Charles Proxy to verify something and found some requests very odd.
I have reported it to the Chrome web store and hopefully they ban it asap.