Pros: Nice looking. Its free.
Cons: Not what it used to be over the years. Compared to other browsers it can not stand up against them anymore. Too much of anything such as too many features and options slow browsing down. Too bad I used it for many years and at one time it was the eagle amongst the sparrows.
Other Thoughts: I have used FF ever since they had the download project in 2008 for FF 3. Then I thought it was the cat's meow and used it until last year when they updated and things started to go down hill from there. Today it now stalls and crashes my Windows 7 and really gets annoying. Chrome is the way to go today. Firefox, move over and let the big boys run ahead.