yes. its faster and more configurable.
There are quicker browsers than firefox but it has a lot more features than them.
With add-ons, this is how my copy functions:
There are no advertisements and no popups in the web pages I see on it. These are all blocked so I never have to look at them.
It notifies me if I visit any dangerous websites before it opens them - protecting my computer
It notifies me how Im going with my buying and selling on ebay. Lets me know if Im losing bids.
It downloads flv videos (youtube etc) (shows a download button under every video I watch so I can click on it if I want to download it)
I Never lose bookmarks (reformat virus, etc),, and no matter what computer I use and wherever I go my bookmarks are always available
It shows questions on Y! Answers with less than 2 answers in a different color so I can see at a glance what questions need answering and what already have enough answers
it shows links on imdb pages to other sites relating to the films im looking up
it allows me to change the size of the text boxes on Y Answers with ctrl+enter so I can see my whole answer
And it looks like google Chrome
---obviously its a personal setup, and Im not suggesting this would all be something everyone needs, but the point of the information is to show how customisable Firefox is. This configuration makes my life a lot easier on the web. I can get more done and my machine is safer. IE offers nothing similar which is why I like FF so much.