Not a silly q
I use Firefox because I don't like IE.
I do like the choice of Add Ons with Firefox - couldn't live without AdBlocker which stops me seeing the ads on web pages; nor FoxMarks which synchronises all the bookmarks and passwords on my pcs; nor scrapbook which saves my collection of webpages methodically; quicknote which takes notes quickly...
I also love the bookmarks toolbar - where I can directly access my favourite sites my clicking on an icon. I have 40 icons across the top of my screen.