A vulnerability was identified in Greasemonkey, which could be exploited by remote attackers to read arbitrary files on a vulnerable system [...]
Solution
Upgrade to Greasemonkey version 0.3.5 :
https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&id=748
Credits
Vulnerability reported by Mark Pilgrim
ChangeLog
2005-07-20 : Initial release
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