Fix specific errors

•  "Firefox is already running but is not responding" error message - How to fix it
•  Could not initialize the application's security component
•  Enable SSL to fix the Firefox cannot connect securely error message
•  Troubleshoot the "Secure Connection Failed" error message
•  Server Not Found - Troubleshoot connection problems
•  "This Connection is Untrusted" error message appears - What to do
•  Warning Unresponsive script - What it means and how to fix it
•  Why does my home page say I need to update Firefox when I have the latest version?
•  Re-enable add-ons that were disabled when updating Firefox
•  Error messages when Firefox won't start (XULRunner - Error and others)
•  Fix problems with Kaspersky, Norton, Google or other toolbars

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. 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.

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:

•  Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
•  Check for new versions of your add-ons
•  How to fix the Update Failed error message when updating Firefox
•  Websites don't load - troubleshoot and fix error messages
•  Disable or remove Add-ons