Ubuntu Security Notice 3991-3 - USN-3991-1 fixed vulnerabilities in Firefox, and USN-3991-2 fixed a subsequent regression. The update caused an additional regression that resulted in Firefox failing to load correctly after executing it in safe mode. This update fixes the problem. Various other issues were also addressed.
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Ubuntu Security Notice 3991-2 - USN-3991-1 fixed vulnerabilities in Firefox. The update caused a regression which resulted in issues when upgrading between Ubuntu releases. This update fixes the problem. Multiple security issues were discovered in Firefox.
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Ubuntu Security Notice 3991-1 - Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the browser UI, trick the user in to launching local executable binaries, obtain sensitive information, conduct cross-site scripting attacks, or execute arbitrary code. Various other issues were also addressed.
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