Firefox 5.0 release hangs on debug.txt denied write access

There is a file in the root folder of Firefox 5.0 called debug.txt. It has zero length and a current timestamp. However if you have no write access to it, Firefox hangs (no CPU used, no file access, it just hangs). This happens to me when trying to open about:support and a site I was trying to browse to, www.elderscrolls.com (possibly due some plugin loading which makes it different from other websites). When I give debug.txt write access, the next time Firefox is started it works normally.
This is troublesome for network administrators that make application directories read-only. I didn't expect to need a read-write accessable debug.txt file that is never written to in the main Firefox install folder...

I don't have a malware infection. I did a filemon scan, if you cared to look at it, a snipit of it is in the system details attached to the original post. Also attached are the security settings of that file, as seen from the windows client that's executing the firefox executable. By the way, the problem as described persists, even when running Firefox in safe mode. It doesn't load any plugins/extensions then. Running safe mode was the first thing I did when I came across this.
I have all my Windows up to date, legal, use up to date virus and spyware tools and haven't had a single virus infection (unless I examined the virusses intentionally) in 20+ years of personal computer usage. This is not a post about an ignorant user for crissake. I'm talking about an actual usability bug. I design, program and debug applications and algorithms cross platform in various programming languages for a living and sysadmin a small business network with various computers with Windows, Linux and MacOS operating systems on there all interacting with each other. I know when I see something strange.

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