[pyepye]

I've been using webextension-toolbox[1] for a few years now to develop cross-platform extensions and it's worked really well. I always got the feeling other browsers other than Firefox were Second-class citizens with web-ext (if supported at all) whereas with webextension-toolbox they all appeared to work out of the box.

The first time I tested my extension on Firefox after developing it one Chrome for months it worked the first time. I was so shocked how seamless it was I actually thought something must be really wrong, it wasn't.

[1] https://github.com/webextension-toolbox/webextension-toolbox

[AlexITC]

While I have the same feeling about Firefox, it still lacks supporting some APIs, the Web Push API being the latest I missed that works properly on Chrome, enabling real push notifications.