Your system may not meet the requirements for Firefox, but you can try one of these versions:

Your system doesn't meet the requirements to run Firefox.

Your system doesn't meet the requirements to run Firefox.

Please follow these instructions to install Firefox.

Firefox Privacy Notice

Mozilla Foundation Security Advisory 2012-10

use after free in nsXBLDocumentInfo::ReadPrototypeBindings

February 10, 2012
Andrew McCreight, Olli Pettay
Firefox, Firefox ESR, SeaMonkey, Thunderbird, Thunderbird ESR
Fixed in
  • Firefox 10.0.1
  • Firefox ESR 10.0.1
  • SeaMonkey 2.7.1
  • Thunderbird 10.0.1
  • Thunderbird ESR 10.0.1


Mozilla developers Andrew McCreight and Olli Pettay found that ReadPrototypeBindings will leave a XBL binding in a hash table even when the function fails. If this occurs, when the cycle collector reads this hash table and attempts to do a virtual method on this binding a crash will occur. This crash may be potentially exploitable.

Firefox 9 and earlier are not affected by this vulnerability.