Mozilla developers fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code.
Bob Clary, Christoph Diehl, Christian Holler, Andrew McCreight, Daniel Holbert, Jesse Ruderman, and Randell Jesup reported memory safety problems and crashes that affect Firefox ESR 38.6 and Firefox 44.
Carsten Book, Christoph Diehl, Christian Holler, Andrew McCreight, Daniel Holbert, Gian-Carlo Pascutto, Tyson Smith, Andrea Marchesini, and Jukka Jylänki reported memory safety problems and crashes that affect Firefox 44.