Firefox don't start because of foxyproxy.xml

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I am working on linux with firefox (3.5.8) and  foxyproxy (1.6). Every time i start ubuntu the first time and i start firefox it hang, if i delete the foxyproxy.xml firefox will start normally, if i then add some new proxies i can close and open frefox without problems, but if i reboot the system, firefox will not start again until i delete the foxyproxy.xml.
Cheers
xuedi