There are many, many pros, and very few cons IMO.
Pros:
- Tabbed Browsing
- Plugins
- Popup Blocker built-in
- Ad blocker (via plugin)
- Security Patches out within a very short period of time. There was one found and within 24 hours they had a patch... I believe MS still hasn't fixed all the holes.
- Not integrated into the OS.
- Open Source
- Smaller footprint, the download is under 5 MB.
Cons:
- Not all websites work in Firefox. Some code specifically to IE only. If I can't use the website, they don't get my money. But in some case you may have to switch if it something that you use for work (ie MS Sharepoint).
- Not integrated into the OS (for some people this is a problem).
- Open Source (some people don't like it)
There are about 100 "offical" extentions right now, and many others floating around right now. The development team is devoted to supporting the W3C standards, and to maintain security. If this browser doesn't do something for you, you can either find an extention that does it or you can make one (if you have the know how).
iSeriesCodePoet
iSeries Programmer/Lawson Software Administrator
See my progress to converting to linux.