There is an easy workaround.
This workaround is successful:
1. Open Firefox 3
2. Disable phishing/attack detection in the security section of the Preferences
3. Close Firefox
4. Make hidden files visible (Locations - Personal folder - View - show hidden files)
5. Delete /home/user/.mozilla/firefox/blahblahblah.default/urlclassifier*.sqlite
6. Open Firefox.
7. There is no next step. You're done. :-)Greetz, Pjotr.
I follow this instruction. It works!!I like the bug report system too much. hahaI hope that the patch will be published very soon. I wait for it.