Can you confirm that, when you downloaded the relevant version of Limewire for your OS, you also downloaded the relevant upgrade of Java. There will be serious problems with your memory allocation in OS 9.1 if you are using an early version of Java (I forget whether you started with Java 1.2.1 or 1.3.1 but, whichever, you need a virtual memory patch to avoid freezes). There are other reasons for freezes but none of them are connected with your firewall — if you have connected and show the green light in the bottom left-hand corner of the window, you have the correct port configuration — and as Osu-uma says, your browser is also irrelevant. We'll get to the other possible causes for freezes if you confirm that you have the appropriate Java installed.