Firefox 1.0.6 allows attackers to cause a denial of service (crash) via a Proxy Auto-Config (PAC) script that uses an eval statement. NOTE: it is not clear whether an untrusted party has any role in triggering this issue, so it might not be a vulnerability.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9280
https://exchange.xforce.ibmcloud.com/vulnerabilities/22371
https://bugzilla.mozilla.org/show_bug.cgi?id=302100
http://www.securityfocus.com/bid/14924
http://www.redhat.com/archives/fedora-legacy-announce/2006-January/msg00004.html
http://www.mozilla.org/products/firefox/releases/1.0.7.html