That minimal Firefox market progress was about a quarter of the entire Web, and enough to see the content of the Web so dramatically transformed over a decade (that even Safari claimed to be Gecko) to a standards based platform with minimal reverse engineering all the IE-isms and documenting those for others to follow, and in so doing opening the playing field for standards compliant browsers.
Your summary, presented as fact, is quite poor and I'm gonna assume you have no particular expertise here and were instead sharing some opinions you picked up rather than sharing any actual history from experience, right?
I was there, a part of almost all of this for 25 years now, so there's my authority. What's yours?