CVE-2016-9064

Add-on updates failed to verify that the add-on ID inside the signed
package matched the ID of the add-on being updated. An attacker who could
perform a man-in-the-middle attack on the user’s connection to the update
server and defeat the certificate pinning protection could provide a
malicious signed add-on instead of a valid update. This vulnerability
affects Firefox ESR < 45.5 and Firefox < 50.