How to Troubleshoot Netflix Error Code F7121-1331

This error can occur if you are using a browser that is not compatible with the Netflix player used to play TV shows and movies. Below are troubleshooting tips to help you solve Netflix error code F7121-1331 on your computer.

What causes Netflix error code F7121-1331?

  • Obtrusive ad blocker: If you are actively using a system ad blocker, it may be conflicting with Netflix.
  • Damaged cookie or cache data: According to some affected users, this problem can also occur due to damaged or improperly stored cookies or cache.
  • Outdated browser version: If the problem is caused by an HTML5 conflict, it is likely because you are using an outdated browser version, causing the streaming service to believe that HTML5 playback is not supported.

How to fix Netflix error code F7121-1331?

Update your Firefox browser

  1. In the upper right corner of your Firefox browser, click the menu button or the three-line icon.
  2. Select Help.
  3. Click the About button on Firefox.
  4. Click the Restart button to update Firefox.
  5. Wait for the process to complete.
  6. After restarting your browser, open Netflix and try again.

Disable Firefox browser extensions

  1. Launch your Firefox browser.
  2. Click the menu button or the three-line icon in the top right corner.
  3. Select Extensions.
  4. Click on Extensions.
  5. Find Flashblock and set it to Disable.
  6. Find [email protected] and set it to Disable.
  7. Open Netflix again.

Frequently Asked Questions

According to some affected users, you may see error F7121-1331 in situations where your Google Chrome or Mozilla Firefox browser is severely out of date or where an error or glitch causes Netflix to believe that the browser trying to connect is not actually supported by the browser.

If you are actively using a system-level ad blocker, it is possible that it may be conflicting with Netflix. According to some affected users, this problem can also be caused by corrupt or improperly stored cookies or cache files.

  1. In the upper right corner of your Firefox browser, click the menu button or the icon with the three lines.
  2. Select Help.
  3. Click the About button on Firefox.
  4. Click the Restart button to update Firefox.
  5. Wait for the process to complete.
  6. Once your browser has restarted, open Netflix and try again.