When it comes to browsers -
Internet Explorer comes free with Windows, it's a Microsoft product and works with just about everything, but there are few frills.
Firefox is a free download from mozilla.org which is a bit like Linux, you can do lots with it but everyone's version is different. When the new user interface arrived here, I had to mess around for a couple of weeks removing add-ons before I could get it to work properly. On the other hand, it's nice to have the add-ons which give you lots of extra thingies on RedHotPawn.
And then there's Chrome. It can have some of the add-ons, but it's not half as clever as Firefox. More likely to behave itself though.