But... Firefox came out before Chrome. It's not like we had to use IE6 until Chrome came out. I started using Firefox as soon as it came out and have used it continuously ever since.
For an end user, Firefox was great. But the wide prevalence of IE meant that
* Sometimes sites worked only in IE or broke subtly in other browsers. The subtle breaking could be layout differences or functionality not available/working because the developers used IE specific technology/javascript
* Developers had to code for the lowest common denominator - IE. It really held back web applications
