You asserted that it was really Mozilla that set up IE's downfall, and that's what my dissent is about.
https://en.m.wikipedia.org/wiki/Usage_share_of_web_browsers
Mozilla/Netscape hovered around 20-30% throughout the 2000s. I.E. was the clear winner without any danger of losing its throne until Chrome came along.
Being a steady competitor != destroy. Chrome and the Google suite is what upended the lopsided browser war.