Considering the features work fine on FF, the actual costs for testing on FF should be minimal.
This is helpfully decimating the marketshare of anything that isn’t Chrome.
Even the VLC authors documented how Google tried paying them to ship Chrome as default with their installers: https://www.youtube.com/watch?v=jWx1P93nS0c&t=48s Google even tried
It doesn't mention when though. If its around the time where MSIE was dominant, well, I (FWIW) got less of a problem with that. Because -even with its profiling- Google Chrome is objectively a far, far better browser than MSIE ever was. And the Google of 2005 or 2010 is a better Google than Microsoft was in 1998 or 2002. Check the Halloween documents on that one.