Literally the only reason they can argue Chrome is more secure than Firefox in that kind of setting is because they can Google can push Google Chrome profiles via Google Workspaces but they’ve never working with Mozilla to create an interop for Firefox.

When Microsoft did this with Windows, AD, and Internet Explore, it was deemed a breach of anti-trust laws. The question is whether such laws apply to Google given they don’t have a monopoly in the identity services domain.

If you’d asked me 5 years ago, I’d have said “no way”, but recent judgements with Apple and their App Store lead me to think there is still hope. Regardless of how remote that might be.