Thanks so much for sharing this and the walkthrough video! It inspired me to finally make the official lynkmi one and I've just submitted it to the Chrome Web Store so it's pending approval atm (so many extra steps to get it in the store!).

I ended up making it from scratch and of course added a bit of an API in the process (mainly for logging in and retrieving tags so you don't have to remember). I'm quite happy with it so should be able to share the code once it's approved.