It's not necessarily on purpose, but as far as I can tell they develop for Chrome first and then make it work in other browsers as needed. The result is that t

It's not necessarily on purpose, but as far as I can tell they develop for Chrome first and then make it work in other browsers as needed. The result is that they do end up depending on various Chrome quirks, including both bugs and things it supports that other browsers don't yet, and the dependencies may or may not be found during testing (which is also Chrome-biased as far as I can tell; I can assure you they test more in Chrome on Android than in Firefox on Android!).