Changes affecting Adobe Flash on Firefox for Mac

Revision Information
  • Revision id: 192244
  • Created:
  • Creator: Wesley Branton
  • Comment: Updated for about:config redesign
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: AliceWyman
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: No
Revision Source
Revision Content
This article only applies to Firefox for Mac.

Starting with Firefox version 62 for Mac, Adobe Flash applets will be run in a more secure mode using process sandboxing.

The sandbox is known to prevent the following features from working:

  • Print to PDF from the Flash print dialog
  • Print to Open in Preview from the Flash print dialog
  • Quicklook in the File -> Open menu
  • Saving files from a Flash applet
  • Flash applets downloading and running the Adobe Air installer
  • Flash triggering Adobe Air applications to run

To disable the Flash sandbox in Firefox, follow these steps:

  1. Type about:config in the address bar and press EnterReturn.
    A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
  2. Find the preference dom.ipc.plugins.sandbox-level.flash and double-click itclick the Edit Fx71aboutconfig-EditButton button.
  3. Enter an integer value of 0 (zero) and click OKclick on the checkmark Fx71aboutconfig-Checkmark to save the change.
  4. Quit and reopen Firefox so that the change will take effect.