I'm not sure that's entirely fair to Netscape and Mozilla. Early versions of IE had absolutely horrible standards compliance, so there was a substantial lock-in

I'm not sure that's entirely fair to Netscape and Mozilla. Early versions of IE had absolutely horrible standards compliance, so there was a substantial lock-in effect. Other browser developers had to expend considerable resources to emulate IE's rendering, bug for bug. Even Microsoft had to bend over backwards to maintain compatibility, via the once notorious quirks mode.