I'm currently using firefox and hate it to bits. My opera is installed on a recently crashed hard disk and I can't be bothered to re-install it. I thought I'd force myself to use firefox but cannot get to grips with it. Just love the way opera has windows that you can resize and minimise. I tried an addin for firefox but it's not the same.
The firefox download and virus scan thing drives me nuts. I'm using IE to download anything now.
I also found that some of the sites I visit have forced adverts which you have to skip. They obviously don't worry about opera as I've never seen them appear on that.
Yes, I know, I should just re-install Opera.