Rainbow 0.5 NOT workin' on FF Rated 2 out of 5 stars

Hi all,
I got a problem that I can summarize with "Error: Rainbow could not load component, are you in 32-bit mode?
Source File: chrome://rainbow/content/injector.js
Line: 84" I'm using Win XP 32-bit Service Pack 3 on Pentium 4 @ 2.67 GHz, NVIDIA GeForce4 MX 440 with AGP8X using FF 11.0a1 Buil 20111118031005... I can say it never worked for me using FF :-(