Changes affecting Adobe Flash on Firefox for Mac

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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. In the address bar, type about:config and press EnterReturn.

    • The about:config "This might void your warranty!" warning page may appear. Click I accept the risk! to continue to the about:config page.
  2. Find the preference dom.ipc.plugins.sandbox-level.flash and double-click on it.
  3. Enter an integer value of 0 (zero) and click OK.
  4. Quit and reopen Firefox so that the change will take effect.
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