Firefox has stopped working

How to fix Firefox has stopped working? | Toll-Free : +1-866-558-4555.

Many times, Firefox users face the issue of Firefox has stopped working but other Web browsers are working normally. In this condition, Firefox also shows a Server not found or Unable to connect error message. There may be other error messages also displaying whenever you try to view websites using Firefox.

Reasons and methods to fix Firefox has stopped working

There are several possible reasons for this error that can be fixed in some easy steps:

Internet Security software blocking Firefox

If you were loading websites normally before updating Firefox or until you have updated Internet security software, it is a possibility that your Internet security software is preventing Firefox from working properly. Make sure your Internet security software is up-to-date. Remove Firefox from the list of your recognized programs and add it back. Follow the instructions on how to configure programs and check the configure firewalls so the Firefox can easily access the Internet.

Firefox connection settings

If you are using proxy server to connect to the Internet with connection problems, you will have problem in loading websites. Follow these steps to check your connection settings in Firefox:

  • Click the three horizontal line menu button and go to Options.
  • Go to the General panel, scroll down to the Network Settings section.
  • From the Network Settings section, go to Settings.
  • Change your proxy settings:

If you cannot connect to the Internet through a proxy, click on No Proxy.

If you are connecting to the Internet via a proxy, simply compare Firefox’s settings to another browser’s settings.

  • Close the Connection Settings dialog box.
  • Also close the about:preferences page. The changes you’ve done will automatically be saved.


 IPv6 is supported by Firefox by default. This could cause connection problems on certain systems. See these steps to disable IPv6 in Firefox:

  • Go to the address bar and type about:config.
  •  Press Enter.
  • You will get a warning page. 
  • Click on I accept the risk! In order to continue to the about:config page.
  • Enter network.dns.disableIPv6, in the search filed.
  • Go to the list of preferences and double-click network.dns.disableIPv6 to set its value to true.

DNS Prefetching

DNS Prefetching is used to speed up loading new websites that can cause page load errors with some system configurations. Follow this procedure to disable DNS Prefetching:

  • Type about:config and press Enter, in the search bar.
  • You may get a warning page.
  •  Click on I accept the risk! to continue to the about:config page.
  • Right-click in the list of preferences and select New.
  • Select Boolean.
  • Enter network.dns.disablePrefetchin the enter preferences name field. Click OK.
  • Set the value to true when prompted. Click OK.

When Firefox cannot load certain websites

If Firefox is loading some websites but not others then you need to clear your Firefox cookies and cache using these steps:

  • Click the Library button and go to History.
  •  Select Clear Recent History.
  • In the Time Range to clear: drop-down, choose Everything.
  • Select both Cookies and Cache.
  • Select Clear Now.

Check for malware

The last option is check your computer for malware. Some malware target Firefox and prevent it from loading various websites. Update detections database of antivirus or Internet security program and do a full scan of your system.

Check if an extension is causing the problem

Many times, a Firefox extension is the reason for this issue. The extensions that have network access or those which rely on manipulating webpage content are troublesome. Try to disable your extensions in the Add-on Manager one by one and then try to reload the page. 

Above methods are easy and simple to follow. If still you are having any issue, you can take the help of customer support team.

Read More : Firefox not responding.

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