the single greatest feature of firefox is its add-ons. the wealth of third party developers who have added so much to the browsing experience makes firefox not only a web browser, but a wonderful experience and interaction with the web.
safari is most notably marketed as the fastest browser for the mac. and it’s true, safari’s rendering engine is pretty fast. you get to see the page loaded up faster than most browsers on the market. as a mac os x user, it’s hard not to drink from the apple kool-aid. yes, mac os x has a beautiful user interface, but just because software comes from apple doesn’t mean that it is the best of breed. it’s usually the case, but not always.
opera is a pretty speedy browser too, i’ve only used it under windows and it does also seem to have a reasonably speedy experience.
internet explorer is my least favorite browser of the major browsers. the newest IE’s user interface is supposed to make it easier to use, i’d imagine, but i find that it’s harder for me to use than easier. it just feels incomplete.
absolute must have add-ons for general firefox use:
adblock filterset.g updater
tab mix plus
additional add-ons for developers:
add n edit cookies
live http headers
user agent switcher