A Mozilla Foundation Security Advisory reports:
Some security checks intended to prevent script injection were incorrect and could be bypassed by wrapping a javascript: url in the view-source: pseudo-protocol. Michael Krax demonstrated that a variant of his favicon exploit could still execute arbitrary code, and the same technique could also be used to perform cross-site scripting.
Georgi Guninski demonstrated the same flaw wrapping javascript: urls with the jar: pseudo-protocol.
L. David Baron discovered a nested variant that defeated checks in the script security manager.
Workaround: Disable Javascript
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