Firefox and Thunderbird crash on F7.

[Erik P. Olsen]

I am in the process of building F7 in order to move from FC5 to F7.

Both TB and FF crash in a similar fashion, so I believe the problems are 
related. I'll start with the FF crash.

To see if it would help to update F7, I added all the latest fixes this morning. 
The problem is still there. It crashes consistently on display of many pages. 
The one I test is Edit -> Preferences. It crashes immediately without going into 
the dialog. The error console shows:

[Exception... "Component returned failure code: 0x80004005
(NS_ERROR_FAILURE) [nsIPrefBranch.getComplexValue]" nsresult
"0x80004005 (NS_ERROR_FAILURE)" location: "JS frame ::
file:///usr/lib/firefox-2.0.0.5/components/nsBrowserContentHandler.js ::
anonymous :: line 500" data: no]
file:///usr/lib/firefox-2.0.0.5/components/nsBrowserContentHandler.js  Line: 482

What can this error be? Unfortunately I have absolutely no understanding of this 
error message.

I do hope someone can help me out of this situation. Thanks in advance.
-- 
Erik.