Cthulhu's Librarian is dead on, with one exception: some pages don't render correctly because they are coded wrong. Firefox has strict HTML and web coding standards, so if your page is wrong, it won't display. IE doesn't care if your code is bad. It ignores a lot of errors. This has some advantages, but from a programming perspective it's a bad idea.Cthulhu's Librarian said:Major downsides?
None
Minor downsides?
You can't run Windows updates or download anything from Micro$oft in Firefox without jumping through a bunch of hoops that M$ calls "Security features". So keep IE on your PC only to download updates.
Occasionally, you will run across a website that is optimized for IE, and it won't format quite correctly on the screen. This is actually caused because IE uses a few non-standard codes which Firefox and other browsers don't conform to, because the IE formatting is not correct. It's not a problem with Firefox, but a problem with IE. But since IE is the most common browser, some sites have chosen to use poor code to work with the popular browser, becasue M$ won't fix the problem on their end.
You need to install a bunch of plugins (Java and some others) which come preinstalled on IE. I actually like this, as I can choose to ignore things I don't wnat, instead of having M$ tell me what must be installed for my browser to work.
Try Nvu. It's based off Composer and it's stand-alone like Firefox and Thunderbird.smootrk said:Firefox is great, although I wish they had Composer (html editor) packaged with it like the older Mozilla Browser did.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.