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Firefox error messages – what they mean and how to fix them

Fix specific errors

Fix Firefox TypeError messages

Firefox will popup an error in a number of situations. Most often this is caused by a misbehaving extension.

Disable common problem extensions

Before going through complicated troubleshooting steps, try disabling these extensions:

  1. 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 Extensions panel.
  3. If you see Orbit downloader or 1-click YouTube downloader extensions, click the disable button next to them.
    • In the past McAfee SiteAdvisor, ZoneAlarm or PC Tools have also been problems.
  4. Click Restart Firefox.

If the steps above didn't solve the problem, try these articles:

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