Netscape v8.0 surprisingly has a useful and unique feature that can be of help to developers working on cross-browser projects. You can view a single page in two different tabs - One tab rendered with the MSIE engine and the other with Netscape's Gecko-based engine which is basically the same as FireFox and Mozilla.
At the bottom left of each tab there is a small icon indicating which of the two engines is used to rendered the page. Clicking the icon enables you to instantly switch from one engine to the other. Very nice to have.