Firefox Release

October 13, 2014

Version 33.0, first offered to Release channel users on October 13, 2014

We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!



  • Various security fixes

  • Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers (237623)



Web Platform


  • PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF

  • Some certificate errors cannot be overridden (1042889)

  • Windows: On some combination of hardware and drivers, the main window could be black. In this case, update your graphics drivers (1083071)

  • Windows: With Avast HTTPS scanning enabled, Firefox will not close correctly (1087674)

  • Windows: Interface may be slow when typing or selecting text (1089183)

All Firefox downloads