Not only that, but Firefox has amazing tooling such as `web-ext` cli, where you can just execute `web-ext sign` and it'll generate the `.xpi` format, run it through automated test, and give you signed versions you can distribute from wherever you want. They even have a polyfill to make the Promise based API that firefox uses compatible to Callback style APIS in Chrome.

Thanks for sharing this. Bookmarked and weekend sorted :)

Good point.