Whenever I double-click on any file to download, for some reason, LimeWire opens up my Internet browser(FireFox) and goes to my home page(Like what would happen if I actually opened it myself).

Sorry for the double post but...This happens when I double-click, right click and choose Download and when I right-click and choose Download As.

It sounds like you're using LW version 4.10 or earlier. Update to the latest version & those spam files will stop doing that. http://www.limewire.com/english/content/download.shtml
But keep in mind that only happens with copyright files & those fake files will still show in your results. So instead, look for those with 10 or 20 or so sources in your search results.

Thes files have 150+ sources, and I'm making sure if I'm trying for songs that I have the right Album and Artist highlighted at the side. Oh and I checked and I have v. 4.10.9, so yeah it's an old one.

Yep ... update to LW 4.12.4 & the browser opening will stop. That's due to a link within those files you try to downld. BTW those ones are fake file results. You'll never download them. And they usually show up with perhaps 100 for one, 99 for the next, etc. under the # column of the search results.