Adobe Flash protected mode in Firefox

This article is no longer maintained, so its content might be out of date.

End of Flash support: Like other browsers and Adobe, Firefox ended Flash support at the end of 2020. Please see End of support for Adobe Flash for more information.

This article only applies to Firefox on Windows.

This article only applies to Firefox on Windows Vista and above.
This article does not apply to the 64-bit version of Firefox available for 64-bit operating systems on Windows 7 and above. Mozilla has its own "NPAPI plugin sandbox" security feature for 64-bit Firefox, which is enabled by default.

Flash protected mode is a security feature implemented by Adobe in 32-bit versions of Firefox for Windows operating systems, when the Flash plugin is installed. This feature is enabled by default, to make it difficult for attackers to access your computer.

Flash protected mode might cause Flash performance problems in Firefox, such as persistent hangs or plugin crashes. This is especially true for users on Windows touchscreen devices and for users who use accessibility tools.

You can turn off Flash protected mode by following these steps:

  1. Click on the menu button New Fx MenuThe image "Fx57menu" does not exist., followed by Add-ons.
  2. Click on the Plugins panel and select Options next to Shockwave Flash.
  3. Click the box next to Enable Adobe Flash protected mode to remove the check mark.
    flash protected mode fx38 Fx55FlashProtectedModeFx60FlashProtectedMode
  4. Click the menu button New Fx MenuThe image "Fx57menu" does not exist. and then click Exit Close 29 to close Firefox completely, so that the change can take effect.

When you reopen Firefox, Flash protected mode will be disabled.

Warning: Disabling Flash protected mode makes your computer more vulnerable to security exploits. Do not disable this feature unless you are affected by poor Flash performance.

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