But it was a completely different situation.
- There was a huge influx of new internet users who were all asking their techy friends which browser to use. This is not the case now. People mostly stick with what they know.
- FF was the better product for pretty much all use cases. If this proposal does go through, this will not be the case. It's nice that FF can block ads, but it's ultimately useless if the average user won't be able to access Netflix/Youtube/Facebook/their bank account. It will be an objectively worse browser.
And as I said, the sustainable solution is browser ballots back by the force of law. It's worked where it's been tried.
Anti-trust based solely on narrow definitions of consumer harm on the other hand, serve only the capital owners. And they'll leverage and co-opt any and every popular and useful innovation: open source, community contributions, open standards, patterns light or dark, etc.