I use I.E 7 and I have not experienced any trouble at all, now or ever! well ok, had one or two troubles months ago.
I had firefox but it decided one day not to work properly so i uninstalled it all. I keep meaning to reinstal it.
Firefox is like I.E. ( internet explorer) but slightly different. It is nicer to look at I tihnk and people say there is less chance of pop ups etc.
You can have firefox and I.E on your computer. If in doubt but you think you want t otry it, then download it, but do not get rid of your I.E. try it out for a few weeks. It will seem different because of the layout i.e. the favourites and tools etc are slightlydifferent.
I tihnk that was the only difference I remember seeing before.
ken
ye get some that are cut out for the job and others just get by from pretending