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Mozilla Foundation Security Advisory 2005-12
Reporter: Omar Khan
Fixed in: Firefox 1.0
Earlier versions of Firefox allowed
data: URLs as Livefeed bookmarks. When they updated the URL
would be run in the context of the current page and could be used to
steal cookies or data displayed on the page.
If the user were on a page with elevated privileges (for example,
about:config) when the Livefeed was updated,
the feed URL could potentially run arbitrary code on the user's machine.
Do not add non-http URLs as a Livefeed bookmark. Upgrade to the fixed version