Warning Unresponsive plugin - What it means and how to fix it

Note: This article does not apply to Mac.
Note: This article does not apply to Linux.

Support ended for all NPAPI plugins, except for Adobe Flash, in Firefox version 52. See this compatibility document and this article for details.

If Firefox shows you a "Warning: Unresponsive plugin" prompt, it means that a plugin, like Flash, is taking longer than expected to do what you requested. This article covers some solutions and workarounds.

Firefox Plugin Hang UI

What action should I take?

If you get this warning once, you can try to click Continue to give the plugin more time to complete your request. This may not always be successful. If you get this warning a second time you should probably click Stop plugin to make the plugin stop immediately (crash).

Prevent plugins from hanging

Here's what to try if you get this warning often:

Note: If you see this warning only on a certain website, your Internet security software may be blocking the content. View the log files for your Internet security software or contact the software provider, to see if content from the website is being blocked.

Disable this warning

If you don't want to be warned when a plugin hangs, you can disable this warning by checking the "Don't ask me again" checkbox. When you do that, Firefox will allow the plugin to hang for up to 45 seconds before it crashes.

If you change your mind and want to re-enable the warning, do the following:

  1. Type about:config in the address bar and press EnterReturn.
    A warning page may appear. Click I accept the risk!Accept the Risk and Continue to continue to the about:config page.
  2. Search for the preference dom.ipc.plugins.hangUITimeoutSecs.
  3. Right-click on it and choose ResetClick the Reset Fx71aboutconfig-ResetButton button.

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