[m-r-r]

> The answer was "nothing really" - it worked out of the box for the main functionality.

Do you mean Chrome supports Promises like Firefox does? Last time I checked, the Chrome APIs were using callbacks for all asynchronous operations.

[weaksauce]

There is a polyfill written by mozilla devs that port the browser namespace and promise based api calls over to chrome if needed.

https://github.com/mozilla/webextension-polyfill