All things must pass it some point. I'm sorry to see it go, but, will give the new browser a chance. The one thing I never liked about IE was there were few extensions and it wasn't very extensible. Probably due to the fact that Firefox and Chrome took most of the users away and the dev pool was small.
I hope Cortana changes all that. I would be using IE as my default browser if just a few of the tools I use with Firefox were available. Hopefully we see some of them come to Cortana.