FF 3.6.15 works great, but FF 4.0 crashes/locks after hardware upgrade?

FF4 worked great on my old system (starting with b.11) but not on my new one. It fails in normal mode as well as safe mode, and on the rare occasion that it runs longer than a second, it locks up so that I have to use the task manager to close it. I have uninstalled/installed Adobe/Java/etc to no avail.
The info on [[http://support.mozilla.com/en-US/kb/Firefox%20crashes%20when%20you%20open%20it|THIS]] page doesn't solve my problem, and when FF4 crashes, it doesn't even generate a crash report (just a 1kb file), so I can't pursue it that way. What gets me is that FF 3.6.15 works great...
This is a clean install of XP, on a clean hdd (reused existing hdd after wiping with DBaN), so I'm reasonably sure I have no viruses - but I scanned with multiple tools anyway, just to be safe, and all of my drivers are the latest versions. The only thing that seems to have changed is the hardware, which I've listed below.
Old system:
XP home sp3 - fully updated
P4 @3.0HT (socket 478)
Gigabyte GA8I848PG m/b
1.5 Gb RAM
GeForce 6200 vga
New system:
XP pro sp3 - fully updated
PhenomII x6 t1055
Gigabyte GA-MA770T-UD3P m/b
4.0 Gb RAM (yes, I know it only sees 3Gb)
ATI HD5670 vga

The link you posted was truncated and I assume is to [[firefox crashes when you open it]].
I have no specific knowledge of this, but reading the linked article and your post, & then your crash signature I note that the module ''mozjs.dll'' has no version date suggesting possibly it is corrupt or malware infected.
It is probably worth following the advice : https://support.mozilla.com/en-US/kb/Firefox%20crashes%20when%20you%20open%20it#w_backdoor-ulrbot-c
That however may be a red-herring in that there is a known related bug filed about version numbers of that file (Bug 634282)
Should you reinstall again, it would be worth paying particular attention to that file.
Have you managed to get any further crash reports, or have you given up on Firefox 4 at present.
You could also try posting in the Mozilazine forums, as some of the posters there are likely to be interested in this sort of problem. You could even try filing a bug about the crash yourself. It is possible that the crash cause is at present under reported if it is causing crashes on startup however I do have firefox 4 running ok on a 32 bit XP. You must first of all confirm you have attempted to startup in [[safe mode]].
Note to start in safe mode if you have two or more versions on your computer you will need to add -safe-mode to the shortcut to the correct version, or type the full path into the run command. (enclose path in inverted commas, leave a space then -safe-mode)
I think you can select the icon and double click it whilst holding shift to start in safe mode also. (works with 3.6 in XP)

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