Hi, I think that this has to be fixed upstream in the Icecat (or even Firefox) project one way or another.
Could you back up ~/.mozilla/icecat ? If you then rename ~/.mozilla/icecat to something else, your old profile will be gone and a new one will be created and it will start up. There's also a command line option for icecat to specify another directory (--profile ...), but not sure whether it would create a new one, too.
pgpIpbr6VTwtS.pgp
Description: OpenPGP digital signature
