How to fix Server not Found errors in Firefox browser

Madalina Dinita
by Madalina Dinita
Former Managing Editor
Download PDF
Affiliate Disclosure

  • Some Firefox users have reported getting a Server not found error when using the browser.
  • Continue reading the article below for more information on how to bypass this problem.
  • If you want to read more about common browser issues, check out our Browser Errors Hub.
  • To learn more about this particular browser, visit our dedicated Firefox page.

Sometimes Server not Found messages can appear in Firefox and prevent you from accessing your favorite websites. This can be a big problem, but today we’re going to show you how to properly tackle this issue.

If you using Mozilla Firefox it is very likely that you have experienced the following error message:

Problem loading page. Firefox server not found.

As with all the error messages out there, troubleshooting this error is not that easy and consists of several steps that one needs to follow.First things first, in order to sort out this error we have to zero in on the cause.

However, if you prefer to stick to Firefox, follow the troubleshooting steps listed below to fix the Server not found error.

How do I fix the Server not found error in Firefox?

  1. Check your browser and Internet connection
  2. Consider using a  different browser
  3. Check your antivirus
  4. Check Firefox proxy settings
  5. Disabling DNS Prefetching
  6. Turn off the IPv6
  7. Restart your modem/router

1. Check your browser and Internet connection

This is one of the most primitive yet effective methods of checking out the reason behind the problem loading page Firefox server not found.

  • Check if the same website opens on other browsers, if not check with other websites.
  • Ensure that the Internet security software and the Firewall settings. Check this link on how to configure your firewall so that the Firefox can function as intended.
  • If you are using a proxy server make sure that the proxy server can connect to the internet.
  • If the website is opened and rendered properly on the other browsers please follow the troubleshooting steps mentioned below.

2. Consider using a  different browser

If none of the solutions listed above or below work for you, then you are left with no choice than to consider the possibility of using a different browser.

With that in mind, we wholeheartedly recommend Opera, a web browser that has been around for quite some time now but has proven itself over time to be evolving in the right direction.

It looks and feels modern and sleek just like a Chromium-based browser, has extensive addon support, but lacks the notorious resource use, making it one of the most lightweight browsers on the market today

It is also one of the few browsers that also come with a built-in VPN, allowing you instant access to otherwise restricted content.



A fast and reliable web browser that is only limited by your Internet connectivity. Get it free now!
Get it free Visit Website

3. Check your antivirus

This is a very peculiar problem and usually, happens when your Internet security software is restricting Firefox from connecting to the internet. Also, remember that some of the internet security suites are capable of blocking access to the Internet despite being in an inactive state.

Also, try to add and remove the Firefox from the list of trusted or recognized programs.

If your antivirus is the problem, perhaps this would be a good moment to consider switching to different antivirus software. There are various antivirus tools on the market.

If you’re looking for reliable antivirus software that won’t interfere with your browsing experience, be sure to try out Bitdefender.

Get now Bitdefender (exclusive discount price)

4. Check Firefox proxy settings

proxy settings server not found

Follow the steps in order to troubleshoot your Firefox proxy server connection settings.

  1. Select the Menu Button and choose Preferences.
  2. Go to Advanced panel.
  3. Now select the Network tab.
  4. Go to Connections and select Settings.
  5. In case you don’t use Proxy Server select No Proxy.
  6. If you connect via a Proxy Server check the Proxy Settings with the other browsers Proxy settings.
  7. Once done click on OK. All the changes made will be automatically saved.

5. DisableDNS Prefetching

about config firefox server not found

DNS prefetching technology is used by Firefox to render the web pages in a much faster fashion and sometimes this might actually play the spoilsport.

  1. Go to the Firefox URL bar and type about:config and then press Return.
  2. The following warning might appear, This might void your warranty! Ignore the message and click on I accept the risk!
  3. Whilst checking out the list of preferences hold down the Ctrl key and select New followed by Boolean.
  4. In the Enter the preference name window select network.dns.disablePrefetch and then click OK.
  5. When asked to set the value select True and click on OK.

new boolean firefox server problems

6. Turn off the IPv6

Firefox switches on the IPv6 by default and this has the tendency to cause issues in certain scenarios. We can try disabling the IPv6 and then check if the problem loading page firefox server not found problem is solved.

  1. Go to the Firefox URL bar and type about:config and then press Return.
  2. The following warning might appear, This might void your warranty! Ignore the message and click on I accept the risk!
  3. In the Search, field enter network.dns.disableIPv6.
  4. Among the list of preferences select network.dns.disableIPv6 and alter its value from false to true.

7. Restart your modem/router

restart PC to solve profile error in chrome

If you’re getting Server not found error in Firefox, perhaps you can fix the problem simply by restarting your modem or router. This issue can occur due to various glitches, and in order to fix the issue, it’s advised that your restart your modem/router. To do that, follow these steps:

  1. Press the Power button on your modem/router to turn it off.
  2. Wait for 30 seconds.
  3. Now press the Power button again to turn the modem/router back on.
  4. Wait while the device boots.

Once your router boots, check if the problem is still there. Additionally, I would also suggest Firefox users to Clear Recent History and in the Time Range to Clear select Everything. Also, consider using cleanup tools like CCleaner and maybe uninstall and reinstall Firefox Browser altogether.

The solutions listed above are equally great if you encounter the following issues:

  • When Firefox starts all of the open tabs say server not found – This happens when Firefox is set to open multiple tabs on startup, but lacks connectivity to any of them.
  • Server is not found Firefox Ubuntu – This happens even when running Firefox on Ubuntu.
  • Firefox not connecting to server – This usually happens due to server timeouts

FAQ: Learn more about Mozilla Firefox

  • Why does my Firefox and Chrome browser keep opening tabs?

If you notice your browser is opening tabs randomly, it can be the effects of malware.

  • Can I import bookmarks into firefox?

Yes, Firefox can import bookmarks from a wide variety of other browsers, including Google Chrome.

  • How can I use Firefox’s Process Manager?

If you want to use Mozilla Firefox’s Process Manager, then you need to download the browser, and then follow the steps listed in this guide.

Editor’s Note: This post was originally published in March 2019 and has been since revamped and updated in July 2020 for freshness, accuracy, and comprehensiveness.