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How do I fix common Firefox error codes?

Published on December 29th, 2021 Updated: April 11th, 2022

One of the most common Firefox error codes is the "Server not found" error. This error code happens when Firefox is unable to find the server that you are trying to connect to. This can happen for a variety of reasons, including incorrect DNS settings, a problem with your ISP, or a problem with the server itself.

1. If you see the error code "404 Not Found" or "400 Bad Request", try reloading the page

Load the page in Firefox again. If the page still does not load, try one of the following: Clear the cookies and cache on your web browser. If you are using Internet Explorer, try switching to the Windows Explorer view. In the address bar, type "about:blank" and press Enter. Click the Tools menu and then click Internet Options. Under the General tab, click the Advanced button. Under the Reset Internet Explorer settings section, click the Reset button. Click the OK button. Restart your web browser. If you are using Google Chrome, try clearing the cache. In the address bar, type "chrome://cache" and press Enter. Click the Clear Cache button.

2. If you see the error code "500 Internal Server Error", try reloading the page or clearing your cookies and cache

If you are seeing an error code such as "500 Internal Server Error," it is most likely because your Firefox is not functioning correctly. Clearing your cookies and cache may fix the issue.

3. If you see the error code "502 Bad Gateway", try reloading the page

If you see the error code "502 Bad Gateway", try reloading the page in order to fix common Firefox error codes.

4. If you see the error code "503 Service Unavailable", try reloading the page

If the Firefox browser is not responding or giving errors, it might be time to reload the page. To do this, go to the Firefox menu, select "Help," and then select "Reload Firefox."

5. If you see the error code "504 Gateway Timeout", try reloading the page

  1. Click on the Firefox menu button (three lines in the top left corner of the Firefox window), and then click on "Preferences."
  2. On the Preferences window, click on the "Advanced" button.
  3. In the "Advanced" window, click on the "Connection" tab.
  4. On the "Connection" tab, click on the "Reload" button.
  5. Firefox will reload the page. If the problem still exists, then you will need to follow the steps for resolving specific Firefox error codes.

6. If you see the error code "505 HTTP Version Not Supported", try reloading the page

  1. Close any open tabs or windows that are related to Firefox.
  2. Click the "Firefox" menu button and select "Reload Firefox".
  3. If the error persists, click the "Help" menu button and select "Troubleshooting Information".
  4. Click on the "Firefox" menu button and select "Tools".
  5. Click on the "Options" button.
  6. In the "General" tab, click on the " Reload Firefox" button.
  7. Click on the "Reload Firefox" button in the "Error Reporting" section.
  8. Click on the "OK" button.
  9. If the error persists, click on the "Help" menu button and select "Troubleshooting Information".
  10. Click on the "Firefox" menu button and select "History".
  11. In the "Firefox History" section, click on the "Reload Firefox" button.
  12. Click on the "Reload Firefox" button in the "Error Reporting" section.
  13. Click on the "OK" button.
  14. If the error persists, please submit a support ticket.