yes sometimes sites show different in firefox and in internet explorer as an example the html comment tag <!-- this is a comment --> do you see me? -->
will show up in internet explorer as: do you see me? --> and in firefox you wont see anything.
Some sites don't work at all in firefox...
I like (and use) firefox because of:
- it's speed of execution
- tabbed browsing
- integrated download manager that allows you to choose a directory for all your downloads
- popup blocker
There are other advantages to firefox compared to IE but the above reasons is why I use firefox
