Mozilla is constantly rolling out new updates to make the user experience better than before on Firefox web browser. Through the years, Firefox has remained one of the go-to names when it comes to browsers as it remains steadfast in its commitment to delivering quality searches.
However, despite all its efforts, Firefox is still embroiled in server connection issues in the form of bugs and errors. A good example of such issues is the error code NS_ERROR_UNKNOWN_HOST. As of writing, no information is available as to what causes this error in particular.
How to Troubleshoot Server Issue and Fix Firefox Browser NS_ERROR_UNKNOWN_HOST Error Code
But this doesn’t mean you just have to put up with the problem and leave things to luck. Here are several general troubleshooting steps you can try and hopefully, one of them will eliminate the error code for you.
Solution #1 – Clear Firefox Browser Cache and Cookies
Clearing the cached web content and cookies on Firefox can solve most problems related to loading web pages. So every time you get the chance, make sure you clear all the cache and cookies simultaneously.
While you’re at it, you can also improve the startup speed of the browser by clearing its startup cache which keeps some temporary data.
Solution #2 – Refresh Your Firefox Browser
Just so you know, the feature called Refresh Firefox can address most error codes as it restores your profile in Firefox to the default state without losing your essential data.
Don’t worry because your browsing history, bookmarks, windows, open tabs, cookies, web form auto-information, and passwords will still be saved even if you refresh your Firefox browser. But keep in mind that the feature will reset your preferences and remove your themes and extensions.
If you’re having trouble starting Firefox as you normally do, you can also try to look for the button for Refresh Firefox in the window for Firefox Troubleshoot Mode. A manual refresh is also possible if you create a new profile and transfer important data to it.
Solution #3 – Uninstall and Reinstall Firefox Browser
Several issues on Firefox, including the error code NS_ERROR_UNKNOWN_HOST, may be the result of an issue with one of the browser’s program files.
In this case, the best thing you can do is to uninstall the browser first and then install it again from scratch. After you’ve installed Firefox, launch it again and check if the error code is gone.
Solution #4 – Restart Your Firefox Browser in Troubleshoot Mode
The Firefox Troubleshoot Mode is the diagnostic mode that can make several changes. It can disable extensions, use the default theme, use default toolbar settings, and disable hardware acceleration.
Solution #5 – Reboot Your Computer
Believe it or not, some of the most mind-boggling error codes can be fixed by a simple reboot of your PC and then launching the Firefox browser all over again.
Solution #6 – Create a New Profile on Firefox
Error codes like NS_ERROR_UNKNOWN_HOST may also be the result of files in the folder of your Firefox profile that correspond to essential data that wasn’t removed by a Firefox Refresh. You can consider creating a new extra profile that doesn’t contain any of the old data you have on Firefox.
The next time you’re prompted with the error code NS_ERROR_UNKNOWN_HOST on the Firefox browser, try the general troubleshooting steps above to check if one will solve the problem for you.
