I started my web dev career when MSIE was accelerating and achieved crazy levels of dominance. Developing for IE was shit. I mean, I was never out of work, but the wasted time figuring out which quirk you were coding around was, frankly, ridiculous when you look back on it. But you had an arsenal of workarounds and techniques which that generation of developer fantastic problem-solvers and have lots of initiative.
Despite how they did it, it is essential that nobody in or around the industry forgets how good MSIE was for mainstream adoption of the internet/www. It literally made it so that everyone was online. This was when the beige box in the corner was your window to the www and very few people had that kind of connectivity in their pocket.
Reflecting on how MS achieved dominance and then essentially backburnered MSIE development really befuddles me to this day. Some of the thoughts in the comments make sense; Was it arrogance and MS seriously thought Win32/.NET would remain dominant? Or simply that they'd dropped the ball in other departments and had to redeploy resources to a profit centre?