Thinkvantage Password Manager and Firefox 3

Woohoo! I found the solution here!

1. Find tvtpwm_moz_xpi.xpi in Client Security Solution install directory (C:\Program Files\Lenovo\Client Security Solution)
2. Open it using your fav zip program (I used 7-Zip)
3. Change install.rdf and update 2.0+ to 3.0+
4. Open chrome/tvtpwm.jar
   
5. Edit content/tvtpwm.js and replace window.addEventListener("load", onLoad, true); with following:
   window.addEventListener("load", function () { gBrowser.addEventListener("load", onLoad, true); }, false);
   
6. Now install tvtpwm_moz_xpi.xpi. You can do this by opening "Add-ons" window (Tools/Add-ons menu) and drag-and-drop xpi file in it.