Fix common audio and video issues

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Sometimes, the video or audio content in a web page cannot be properly downloaded and displayed in Firefox. A required plugin may be missing, outdated, blocked, in conflict with another plugin or extension, or the content may be blocked for some reason. This article will help you solve these problems.

Note: If you see the shield icon Mixed Content Shield in the address bar and you're having trouble with that website, please see How does content that isn't secure affect my safety?

YouTube HTML5 Video Player issues

The YouTube HTML5 Video Player may cause various playback issues for some users, such as missing audio or out-of-sync audio and video. Switch to the Flash plugin, if installed and enabled, to see if that fixes the problem. You can use the YouTube Flash Video Player add-on to easily switch between the HTML5 player and the Flash plugin.

Plugins

Install missing plugins

Although Firefox is able to handle certain HTML5 audio and video content on web pages, it may need the help of media players and browser plugins for other content. Although you may have the correct media players installed to play video and audio files, you may be missing the necessary plugins when the media is embedded within the web page itself.

When a plugin is missing, do the following:

  1. Click on the download link.
    Plugin Needed
  2. Follow the instructions.

In case the installation fails, install it manually.

When a plugin is missing, a message will appear in place of the content:

  • "A plugin is needed to display this content" indicates that the plugin is not installed on your machine.
    flash required fx35

If a link to download the plugin does not appear, install the plugin manually by visiting the instructions for the plugin that you want:

For other, less common, media players and their plugins, see these websites:

Enable plugins

If a plugin is disabled in the Add-ons Manager, you won't be able to use it.

  1. At the top of the Firefox window, click on the Firefox buttonOn the menu bar, click on the Tools menuAt the top of the Firefox window, click on the Tools menu, and then click Add-ons. The Add-ons Manager tab will open. Click the menu button New Fx Menu and choose Add-ons. The Add-ons Manager tab will open.

  2. In the Add-ons Manager tab, select the Plugins panel.
  3. Review the list of plugins to see if any of them are disabled.
    • To enable a plugin, select it and click the Enable button.

Enable or activate plugins

If a plugin is disabled in the Add-ons Manager, you won't be able to use it.

  1. At the top of the Firefox window, click on the Firefox buttonOn the menu bar, click on the Tools menuAt the top of the Firefox window, click on the Tools menu, and then click Add-ons. The Add-ons Manager tab will open. Click the menu button New Fx Menu and choose Add-ons. The Add-ons Manager tab will open.

  2. In the Add-ons Manager tab, select the Plugins panel.
  3. Review the list of plugins to see if any of them are disabled.
    • To enable a plugin, click on Never Activate and select either Ask to Activate or Always Activate in its drop-down menu.

If you see an Activate (name of plugin) icon on web pages, where the plugin content should be, you'll need to click on the icon to activate the plugin:

activate flash

For more information, see Why do I have to click to activate plugins?.

Update your plugins

Check that you have the latest versions of all your plugins.

  • Go to our Plugin Check page and follow the links to update any plugins that are out of date.

Allow Plugin Container in your Internet security program

Allow your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) to trust plugin-container.exe also known as Plugin Container for Firefox. For detailed instructions, see Configure firewalls so that Firefox can access the Internet where in that case Firefox means Plugin Container for Firefox.

Disable a conflicting plugin

If you have more than one plugin installed that can handle the same media type, this can cause a conflict that prevents some embedded media from playing. You may be able to fix the issue by disabling one of the plugins.

  1. At the top of the Firefox window, click on the Firefox buttonOn the menu bar, click on the Tools menuAt the top of the Firefox window, click on the Tools menu, and then click Add-ons. The Add-ons Manager tab will open. Click the menu button New Fx Menu and choose Add-ons. The Add-ons Manager tab will open.

  2. In the Add-ons Manager tab, select the Plugins panel.
  3. In the list of plugins, select the plugin you wish to troubleshoot.
    • If you want to disable the plugin, click the Disable button.
    • If you want to re-enable the plugin, click the Enable button
  1. At the top of the Firefox window, click on the Firefox buttonOn the menu bar, click on the Tools menuAt the top of the Firefox window, click on the Tools menu, and then click Add-ons. The Add-ons Manager tab will open. Click the menu button New Fx Menu and choose Add-ons. The Add-ons Manager tab will open.

  2. In the Add-ons Manager tab, select the Plugins panel.
  3. In the list of plugins, select the plugin you wish to troubleshoot.
    • If you want to disable the plugin, select Never Activate in its drop-down menu.
    • If you want to re-enable the plugin, select Always Activate in its drop-down menu.

For example, you may need to disable the VLC plugin to play embedded QuickTime or Windows Media content. For more information about troubleshooting problems caused by plugins, see the Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems article.

Other solutions

Clear the cache

See How to clear the Firefox cache.

Disable interfering extensions or ad-blocking software

  • Ad-blocking software, such as anti-banner filters of your Internet Security program, or extensions, such as Flashblock or Adblock Plus, can prevent audio or video content from playing. If the site works with ad-blocking disabled, you may want to add the site to your whitelist in your adblocker filter.
  • Any Firefox extension can also block plugins. If the video or audio plays when you disable all extensions, then one of your extensions was causing the problem. For more information, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

Check some Firefox settings

Remove specific entries in the hosts file (advanced users)

If you use a hosts file, you can temporarily disable it by renaming it Xhosts. Or, you can edit the hosts file to remove specific entries such as ad.doubleclick.net that can cause videos on certain sites to fail (for more information, see this MozillaZine forum thread). To apply changes to your hosts file, you may need to flush the DNS cache by entering the command: ipconfig /flushdns in the Run dialog box on Windows.




Based on information from Video or audio does not play (mozillaZine KB)


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