Thanks for making this. Added!
Wish it wasn't so intrusive though - make it a hover over on top of any address - no icons or other elements being inserted or surrounding it. Otherwise it collapses stuff on some websites.
Also make an option to disable that giant QR code - kind of unnecessary IMO.
where is your pull request?
If you create an issue on github we will not forget it. You are totally right but i would put these changes in some plugin menue. Also this might conflict with other mouseovers the address might have. None of us 4 ever did a chrome plugin and i will most likely have no time to implement it myself too soon.