I applaud them for getting it out the door, though.
In the tech world, just like in most other sectors, you don't get points for showing up early to a race; you get them for crossing the finish line, sometimes years after the race began.
We'll never know how things might have gone without that monopoly abuse. Maybe Mozilla would have had enough developers and testers to fix things without abandoning what made Firefox unique.
On the contrary, Facebook, Microsoft, Amazon, WhatsApp, Skype, Netflix and pretty much every single tech giant that enjoys a quasi monopoly over their market today, they all arrived pretty late. Not second to market, mind you. Waay late.
That really isn't impressive at all compared to replicating said infrastructure. Why would you even mention it?