Thanks for your review! I'd be interested in having a screenshot of how the popup looks on your windows machine (do not hesitate to drop a file here if you want: http://bit.ly/2gghJTY) because I don't have any issue on the machines I have around me.

As for the code, there's no github repo for now, but I've been hosting the code on a bitbucket repo that you can access through the "Addon homepage" link. I've not thought about opening it to pull requests, the code is still pretty rough, but why not. I've also worked on a public roadmap that I'll disclose on next release, so that everyone can publish and vote for ideas.