The sad truth is, some companies will look at Statcounter[0] and say because Firefox does not reach 5% global population and decided not supporting it, actively or passively.
[0]: https://developer.chrome.com/docs/web-platform/element-captu...
[1]: https://developer.chrome.com/docs/web-platform/document-pict...
In this case, there's also people from Mozilla onboard, so there's no guarantee that it'll remain chrome only or that chrome will keep it if the spec doesn't go anywhere.
In fact, much of the web as we know it evolved this way. We have IE to thank for AJAX, after all.
[0]: https://github.com/mozilla/standards-positions/issues/1288
[0]: https://developer.mozilla.org/en-US/docs/Web/API/HTMLGeoloca...
[1]: https://mdn.github.io/dom-examples/geolocation-element/basic... (requires Chromium)