Here's the Firefox extension:
click me. The extension is very simple, I don't think that I need to guide you. But I'd be glad to tell you how you rip better protected videos.
I've started to upload the 4 files (.flv) and when they're up, I'll upload the other one.
Edit: Here are the first 4 videos:
[link removed by myself]. I'm having trouble with the one that you just gave me.
Now that I've helped you, maybe you can help me:
read this one.