Sounds like a Firefox file got corrupted. Try starting in Safe Mode and see if that helps; if that doesn't do it, you'll probably need to re-install FF Portable.
You can also try asking on the MozillaZine forums; since this seems to be a FF issue instead of a FF Portable issue, they'll be able to help you more than we can.
"The question I would like to know, is the Ultimate Question of Life, the Universe and Everything. All we know about it is that the Answer is Forty-two, which is a little aggravating."
We need more details to be able to help.
I am a Christian and a developer and moderator here.
“A soft answer turns away wrath, but a harsh word stirs up anger.” – Proverbs 15:1
Sounds like a Firefox file got corrupted. Try starting in Safe Mode and see if that helps; if that doesn't do it, you'll probably need to re-install FF Portable.
You can also try asking on the MozillaZine forums; since this seems to be a FF issue instead of a FF Portable issue, they'll be able to help you more than we can.
"The question I would like to know, is the Ultimate Question of Life, the Universe and Everything. All we know about it is that the Answer is Forty-two, which is a little aggravating."