Changes affecting Adobe Flash on Firefox for Mac | How to

Changes affecting Adobe Flash on Firefox for Mac

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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Last Update: 2018-09-07

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