You're missing Opera and Safari, and a number of others I can't think of off the top of my head. This topic is done to death -_- Anyways, I use Firefox with the following addons:
NoScript (for security), Ad Block Plus (guess), Fasterfox, IETab (for when pages don't load right, which is quite rare), and CookieSafe (utilized rarely).
There's a few others like batch download, but they're pretty minor.
I only use Batchdownload for archiving webcomics, and then only if they have numeric, non date-based image names. If not, then I use some crazy looking bash scripting in Cygwin.
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Religion: Apathetic agnostic
Political Affiliation: Independent