Hi,
I've been using the latest version of FF portable 2.0.06 on my laptop from work to avoid "installation permissions" issues.
but I'm having a very strange issue.
when connected to the office lan, everything works perfect.
When connected to the 3G card, after some minutes of browsing, i get a nice BSOD 
I've run some tests against memory to clear this item from the "faulty hardware" list in my head, the test is ok.
I've tried the same thing with IE, and the PC does not crash.
i've tested in battery mode and power cable mode.
let me know any tests i can do.