A buffer overflow occurs when drawing and validating elements using Direct 3D 9 with the ANGLE graphics library, used for WebGL content. This is due to an incorrect value being passed within the library during checks and results in a potentially exploitable crash. Note: This attack only affects Windows operating systems. Other operating systems are unaffected. This vulnerability affects Thunderbird < 52.5.2, Firefox ESR < 52.5.2, and Firefox < 57.0.2.
https://www.mozilla.org/security/advisories/mfsa2017-30/
https://www.mozilla.org/security/advisories/mfsa2017-29/
https://www.mozilla.org/security/advisories/mfsa2017-28/
https://bugzilla.mozilla.org/show_bug.cgi?id=1402372