I gave up on Netscape under Linux around Netscape 6. How the hell they managed to make it so unwieldy and unresponsive I'll never know, but it put me off of them for good.
Never had a problem with the Mozilla installer under Slackware - what were the issues you were seeing with it?
Odd... I've had it misplace libraries before, but some symlinking / moving of stuff fixed it fairly easily. That's more the exception than the rule, though.