You could try reading the 'Firefox crashes when you open it' article.

The 'Getting your crash report' section can help to troubleshoot the issue.

I had read all those and determined the problem was this bad add-on ThinkVantage Password Manager which is identified as invalid and greyed out. My problem is how to delete it. Apparently it is identified in some hidden location or registry which I do not have access to. To go on to the next release it must be totally removed first. A google search has many posts on this problem even some solutions that work for XP but not for VISTA.

Where do you see that ThinkVantage Password Manager listed (and greyed-out) - as an extension or as a plugin?
Tools > Addons = Extensions & Plugins

If it is an extension, see this:
http://kb.mozillazine.org/Extensions_Uninstall#Uninstalling_manually

If it is installed as a Plugin, see this:
http://kb.mozillazine.org/About:plugins

Read the paragraph about plugin.expose_full_path to have Firefox show you the full path to that plugin, by toggling a a hidden setting. Once you know where that plugin is located on your hard drive, you'll know which file/s to delete.

I realize this thread is a little stale, but I had this problem w/Windows 7 using Firefox 3.6. Got rid of it by doing this: go to Firefox menu Help/Troubleshooting Information, look at the Extensions and note the GUID (the 32 character hexadecimal string) that corresponds to the Lenovo extension. Then go to registry key HCCU/Software/Mozilla/Firefox/Extensions and look for the same GUID that you noted on the Firefox troubleshooting page. Delete that key. Done! (if you don't understand the last sentence about the registry, you should probably not try this) Now if you want to keep the problem from coming back (by dealing with the offending Lenovo xpi archive) there is plenty of info on Lenovo support site on this Firefox compatibility issue...you can even find a patch to fix the problem.