Preaching to the converted, I know, but I thought i'd share my experience.
I tried Mozilla and Firefox back when I first heard of them, and wasn't overly impressed. Then I got my Mac and wanted to install Mozilla because I thought it would more powerful than Firefox. I liked it (Tabbed browsing

), but was never too happy with it, as it was dreadfully, drearily slow. I thought I would try Firefox. It was OK, much quicker, but a bit basic. So I checked out the extensions, and there are some awesome ones out there, which really make it a good browser. (Image Zoom, Download Them All, Translator, Paste Quote - paste text with forum-style quote tags around them. etc.) So much so i'll probably start using it on my Windows machine. Just thought i'd share that with you guys.