One thing I do like about FireFox over Netscape - is in Netscape, you may have multiple tabs open which is great, but if you out of habit go and hit the upper X in the top right corner, all tabs are closed.

In FireFox, if you do that - you will get a warning that you have XX tabs open, do you really want to close all tabs - Which I did not, just wanted to close the 1 tab.