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Firefox could not install the file at http://releases.mozilla.org/pub/mozilla.org/addons/1865/adblock_plus-1.3.6-fn+tb+fx+sm.xpi because: Signing could not be verified. -260

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Tried to install AdBlock Plus and this is the message I got: Firefox could not install the file at

http://releases.mozilla.org/pub/mozilla.org/addons/1865/adblock_plus-1.3.6-fn+tb+fx+sm.xpi

because: Signing could not be verified. -260