IE is honestly not that difficult to get things to work in. What I always do when coding, is have the document opened in IE and FF at the same time, and as I save I refresh both to make sure there are no errors in either, and if there are then I fix them there and then.. Rather than going back after coding it and figuring out all the problems.

Firefox is surely a better browser etc, but you'll still need to make it compatible in IE as it is probably the #1 used browser since it comes already installed on a hard drive that has Windows etc.