Cross-site scripting by dropping javascript: link on tab — Mozilla

Dropping a javascript: or data: link on a tab executes in the context of the site already loaded in the tab. If an attacker could convince a user to drag and drop such a link on a particular tab this could be used to steal information or credentials associated with the site in that tab...

CVE-2005-0148: Undefined Security Weakness

Thunderbird before 0.9, when running on Windows systems, uses the default handler when processing javascript: links, which invokes Internet Explorer and may expose the Thunderbird user to vulnerabilities in the version of Internet Explorer that is installed on the user's system. NOTE: since the...

javascript: links in Thunderbird launch Internet Explorer — Mozilla

Clicking on javascript: links in Thunderbird launched the default handler for that scheme registered with the OS. On the Windows operating system Internet Explorer is the default handler for the javascript: scheme even when Firefox is the default browser...

CVE-2004-0905: Undefined Security Weakness

Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 allows remote attackers to perform cross-domain scripting and possibly execute arbitrary code by convincing a user to drag and drop javascript: links to a frame or page in another domain...