The cost was huge, but Firefox is much more competitive than it was. Chrome was faster for a pretty long time and was heavily marketed. It was bundled with lots

The cost was huge, but Firefox is much more competitive than it was. Chrome was faster for a pretty long time and was heavily marketed. It was bundled with lots of common utilities on Windows. Then things got to the point where developers started doing the "IE thing" and only testing with Chrome. Developers were complicit in this because they repeated the same mistakes of the past. It's amazing how just a few years pass and the next wave of developers are oblivious to what came before. My move to the latest (quantum?) Firefox has been beset by horrific energy use problems on macOS. Those have only just been fixed, but things are much better now. I hope the FF team keep their focus because with Microsoft and Opera giving up on their engines we need Mozilla more than ever.