- 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 remove that as well.
If you’re seeing this error on a regular basis, and also if that address is correct, here are a few things you can try
What do I do if Firefox can’t find websites?
1. Try another browser
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.
More so, it is far faster and more responsive than Firefox, and it brings an entire array of security features to the table natively.
These include an ad and tracker blocker, as well as a VPN service that doesn’t have any traffic limit.
Access all of the websites that you've ever needed without any restriction thanks to this amazingly versatile web browser.
2. Reinstall Mozilla
- In the Windows Search bar, type Control and open Control Panel from the list of results.
- From the Category view, click Uninstall a program under Programs.
- Right-click on Mozilla Firefox and Uninstall it.
- Restart your PC.
- Download Mozilla Firefox. Install it and try connecting again.
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.
One great uninstaller is IObit Uninstaller Pro, as it focuses not only on efficiency when it comes to deleting data, but is also incredibly easy-to-use.
Simply download the program and launch it, select the program that you want to remove, then choose whether to delete the leftover data as well.
IObit Uninstaller Pro
Remove Mozilla Firefox from your PC and prepare for a clean reinstall with this handy software tool.
3. Check your connection
- Try using the wired connection instead of the wireless.
- Restart your router/modem and PC.
- Flush DNS:
- Press Windows key + S to summon the Search bar.
- Type cmd, right-click Command prompt and run it as an administrator.
- In the command line, type the following commands and press Enter after each:
- After the process ends, type in this command and press Enter:
- Close the Command Prompt.
- Run the dedicated Troubleshooter:
- Temporarily disable the VPN/Proxy.
- Update the router’s firmware.
- Reset router to factory settings.
Alternatively, open a second browser and try connecting. If you’re having better luck, then move to the additional steps below.
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.
4. Clear Firefox’s cache
- Press Ctrl + Shift + Delete to open the Clear browsing data dialog box.
- Check all boxes and select Everything under the Time range.
- Click Clear now.
Firefox, as 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 try connecting again.
Just don’t forget to back up your passwords, as this procedure will delete those, too.
5. Disable Add-ons
- Open Firefox.
- Click on the hamburger menu and expand Help.
- Choose Restart with Add-ons disabled.
- Click Restart.
- Try accessing any sites and look for improvements.
And this is how to disable them for good:
- Press Ctrl + Shift + A to open the Add-ons menu.
- Disable every add-on individually and restart Firefox.
- Look for changes.
Even though this is a long shot, disabling 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.
6. Disable IPv6, Proxy, and DNS prefetching
- Open Firefox.
- Type about:config in the address bar and press Enter. Accept the risk.
- Search for IPv6 in the search bar.
- Right-click on network.dns.disableIPv6;false and click Toggle.
And these steps should show you how to disable Proxy:
- Click on the hamburger menu and open Options.
- Scroll to the bottom and open Settings under the Network Proxy.
- Select No proxy and click OK to confirm changes.
Finally, here’s how to disable the DNS Prefetching option:
- Repeat the first 2 steps from the IPv6 instructions.
- Right-click on the list and select New > Boolean from the contextual menu.
- In the preference dialog box, type network.dns.disablePrefetch and press Enter.
- Set the preference as True and restart Firefox.
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.
That should do it. In case you’re still unable to address this, 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.
Frequently Asked Questions
may fail to find and load particular websites due to incorrect proxy and DNS settings, malware, or Internet connection issues. Find a quick fix in our helpful guide.
If Firefox is crashing, too slow, or using too much CPU, consider refreshing it or clearing browsing data, as explained in this extensive guide.
A common connection error with Firefox is Server not found. If that is the case here, the antivirus or some proxy settings might get in the way.