Firefox

Some reasons why Firefox rocks:

Browsing in Tabs
Allows you to load pages into separate tabs.

You can bookmark a group of tabs. e.g. you can open 5 different web sites and bookmark them all with one click. (select Bookmarks, Add, and tick the "File as group" option.)

Popup Windows
Disable all those annoying PopUp and PopUnder adverts.

Ad Blocking
You can block all images from a server (e.g. a banner advert site) simply right click the image and "Block images from" (this server)

Settings
Change your mind about any configuration changes you apply - rather than a bunch of cryptic keys hidden in the registry somewhere, most settings can be edited right under the Tools menu.

For advanced settings type about:config into the URL bar.

Skins
The default appearance of Firefox is pretty uninspiring, but I guess this is to encourage you to install one of the many cool themes available.

Google
Set google as the default search in the sidebar, address bar and context menu.

Saving pages
Firefox allows IE style saving of HTML pages with or without graphics attached, but takes this a step further - you can context click and "View Page Info, Media" - this will list all the images, Media files, Flash etc and allow you to save individual files.
You can also select part of a page and context click to "view selection source".

Performance
Even before you disable popups, Firefox is as fast if not faster than IE - to test this try loading the same page in each browser, but clear the cache first so you get a fair comparison.

Related

TakeBackTheWeb - OS X themes for Firefox (Macinosh)
Browser Security Test - On-line Health Check
Googlebar - Open source version of the Google toolbar
about:config - Preferences
browser.tabs.LoadFolderAndReplace = false
browser. tabs.closeButtons = 0-3
browser. throbber. url = url