I don't think it's too difficult to understand.. they want a supported method to open their own apps using their own browser, guaranteeing any QA done on those

I don't think it's too difficult to understand.. they want a supported method to open their own apps using their own browser, guaranteeing any QA done on those apps will cover any potential onslaught of bug/support workload due to third party browsers. I'd prefer it if these things opened in Firefox, but I can just as easily see how from an engineering perspective they want this mechanism and are willing to defend it. From that perspective, Firefox is intentionally fucking around with OS internals in a way that could create costs for their support org. (edit: please don't shoot the messenger. I'm an affected user too)