Looking at the current numbers, Mozilla Firefox is the greatest alternative to Google Chrome. After Mozilla revitalized its native browser with the Quantum update, Firefox retook its rightful place.

Some of your extensions might cause this error

  • Hmm. We’re having trouble finding that site Firefox error can be caused by a connection downtime.

  • You should be able to check that by quickly switching to another browser.

  • If the error doesn’t replicate, then flush your DNS or run the connection troubleshooter to try and fix Firefox.

  • Sometimes, the browser cache might get in the way, so make sure to clear that as well.

  • Easy migration: use the Opera assistant to transfer exiting Firefox data, in just a few steps

  • Optimize resource usage: your RAM memory is used more efficiently than Firefox does

  • Enhanced privacy: free and unlimited VPN integrated

  • No ads: built-in Ad Blocker speeds up loading of pages and protects against data-mining

  • Download Opera

However, in spite of a myriad of upgrades, Firefox is far from flawless. Some users encountered the Hmm. We’re having trouble finding that site. If that address is correct, here are three other things you can try: error on Firefox followed by a few troubleshooting techniques. Apparently, this occurs frequently.

If you’re seeing it on a regular basis and the address is correct, here is everything you need to know about the error and the solutions for it.

Why is Firefox having trouble finding that site?

The problem is encountered on Firefox due to the presence of conflicting extensions, generally, those having to do with the antivirus or the ones that modify the network settings.

Other than that, your computer’s network settings might be misconfigured and cause the Hmm. We’re having trouble finding that site. Firefox error. Also, corrupt browsing data has too been found to be the culprit here.

Quick Tip:

Before committing to try and fix Mozilla Firefox, maybe you should consider replacing it altogether, or at least use another browser until you fix it.

One great alternative is Opera. This web browser is built using the same source code as Google Chrome and Edge, namely the Chromium engine.

What do I do if Firefox can’t find websites?

1. Reset the network settings

  • Press Windows + R to launch the Run command, enter wt in the text field, press and hold the Ctrl + Shift key, and click on OK.
  • Click Yes in the UAC prompt that appears.
  • Press Ctrl + Shift + 2 to open the Command Prompt tab.
  • Now paste the following commands one at a time and hit Enter after each: ipconfig /release ipconfig /renew ipconfig /flushdns

Once done, restart the computer for the changes to come into effect and check if the Hmm. We’re having trouble finding that site. Firefox error is fixed.

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2. Run the dedicated Troubleshooter:

  • Press Windows + I to open the Settings app, and click on Troubleshoot on the right.
  • Click on Other troubleshooters.
  • Locate the Internet Connections troubleshooter and click the Run button next to it.
  • Follow the on-screen instructions to complete the process.

Connection issues are always difficult to deal with due to a variety of possible reasons why the network is down. Maybe it’s on your side or maybe is the ISP. So, it’s best to let the dedicated troubleshooter do all the hard work.

3. Clear Firefox’s cache

  • Press Ctrl + Shift + Delete to open the Clear browsing data dialog box.
  • Select Everything under the Time range to clear dropdown menu.
  • Make sure to check all the options here, and then click on OK.

Firefox, like any other browser, collects a lot of cached data. Besides the browsing history, it’ll collect cookies that store the website data.

The intention here is to speed up your surfing experience, but cookies can, when pilled up, cause issues within the browser. What we recommend doing is clearing all browser-stored files and trying to connect again.

Just don’t forget to back up your passwords, as this procedure will delete those, too.

4. Use the Troubleshoot Mode to identify issues

  • Open Firefox, click on the hamburger menu and select Help.
  • Next, click on Troubleshoot Mode.
  • Click Restart in the confirmation prompt.

Firefox will now launch with the extensions, and other customized items disabled. Now check if you are able to open the websites that were inaccessible before. If that’s the case, it’s likely that one of the disabled items caused the issue. So, we will now start disabling the extensions.

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Before you proceed, make sure to close the Troubleshoot Mode window and launch Firefox normally.

  • Press Ctrl + Shift + A to open the Add-ons page.
  • Select Extensions from the left.
  • Turn off the toggle to disable the extension.
  • Disable the extensions one at a time, restart the browser after each, and check if the problem is fixed. Once the problem is eliminated, the extension last disabled was causing it.
  • Click on the ellipsis next to it, and select Remove.
  • Again, click Remove in the confirmation prompt.

If nothing else worked yet to fix the Hmm. We’re having trouble finding that site. Firefox error, disabling the add-ons might help. This especially applies to proxy/VPN extensions that hide your IP address and replace it with the public one.

They are only browser-based, and, in my own experience, free options never worked for me. They either have a low data limit or slow down the bandwidth substantially.

Paid solutions are much better but they still fall short in comparison to VPNs.

5. Disable IPv6, Proxy, and DNS prefetching

  • Open Firefox, paste the following path in the address bar, and hit Enter:about:config
  • Click on Accept the Risk and Continue to proceed.
  • Enter network.dns.disableIPv6 in the search bar, and use the toggle on the right to set it to false. to disable IPv6.
  • To disable the DNS Prefetch option, paste network.dns.disablePrefetch in the search bar, and click on the toggle to set it to true.
  • To disable Proxy, paste the following path in Firefox’s address bar and hit Enter:about:preferences
  • Scroll to the bottom and click on the Settings button under Network Settings.
  • Select No proxy and click OK to confirm the changes.
  • Restart Firefox for the changes to come into effect.

Mozilla Firefox works with IPv6 rather than with IPv4. If you’re sticking with the IPv4 protocol solely, we recommend disabling the IPv6 in Mozilla Firefox.

This should avoid further issues and the aforementioned error should be dealt with. In addition, if you don’t use the general Proxy server settings, we suggest disabling this option, too.

And, finally, disable the DNS Prefetching. This feature allows Firefox to load uncached sites faster.

6. Reinstall Mozilla

  • Press Windows + R to launch Run, enter appwiz.cpl in the text field, and click OK.
  • Select Mozilla Firefox from the programs listed here, and click Uninstall.
  • Follow the on-screen instructions to complete the process and once done, restart the computer.
  • Now, download Mozilla Firefox from the official website and install it.

A better way to uninstall Mozilla Firefox is if you use a dedicated third-party uninstaller since it will not only get rid of the program itself but also any residual files that it may otherwise leave behind.

We recommend picking one of the best uninstaller software because they are proven to be completely safe. They do not affect anything else on your PC besides the apps you want to remove.

On top of that, most worthwhile uninstallers come with additional optimization features that help your PC run smoother. They are easy to use and they will eliminate any possible errors that may occur when trying to reinstall.

That should do it! In case you’re still encountering the Hmm. We’re having trouble finding that site. Firefox error, we recommend sending a ticket to Mozilla support.

On that note, don’t forget to share your questions or alternative solutions with us and our readers in the comments section below.

If the advices above haven’t solved your issue, your PC may experience deeper Windows problems. We recommend downloading this PC Repair tool (rated Great on TrustPilot.com) to easily address them. After installation, simply click the Start Scan button and then press on Repair All.

Still having issues? Fix them with this tool:

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