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Showing content from https://support.mozilla.org/en-US/kb/warning-unresponsive-plugin below:

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

This article is no longer maintained, so its content might be out of date.

Like other browsers and Adobe, Firefox ended Flash support at the end of 2020. Please see

for more information.

Note: This article does not apply to Mac.

Note: This article does not apply to Linux.

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.

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).

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

• Update your plugins.
• Pause plugins (Flash videos, games, music, etc.) running in other tabs or close those tabs.
  • For more about Flash, see Playing Flash videos makes Firefox hang.

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.

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 Accept the Risk and Continue to go to the about:config page.
2. Search for the preference dom.ipc.plugins.hangUITimeoutSecs.
3. Right-click on it and choose Click the Reset button.

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