Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Netflix Error F7121-3078

  • 5 replies
  • 1 has this problem
  • 1 view
  • Last reply by Kiki

more options

I tried to watch Netflix on your browser but got the error message above with a statement along the lines that I needed to install the latest update of firefox.

"It means that the version of Mozilla Firefox you're using on your computer is no longer supported. Follow these steps to fix the problem."

I did update and restarted the browser and later my computer, the same message is appearing.

I tried to watch Netflix on your browser but got the error message above with a statement along the lines that I needed to install the latest update of firefox. "It means that the version of Mozilla Firefox you're using on your computer is no longer supported. Follow these steps to fix the problem." I did update and restarted the browser and later my computer, the same message is appearing.

All Replies (5)

more options

Hmmm. Your User Agent looks okay to me: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0


Websites say that Firefox is outdated or incompatible even though it's the latest version

https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox

You can check out at the browserspy website how websites see you:

http://browserspy.dk/browser.php

http://browserspy.dk/headers.php

more options

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

If there is still a problem,

Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

While you are in Troubleshoot(Safe) mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

more options

Make sure you have the latest Widevine plugin installed.

Try to toggle DRM off/on to see if that makes Firefox (re)load DRM components.

You can possibly check the XHR requests in the Browser Console if this doesn't work.

more options

Hi rangikudoug, did this help:

cor-el said

Make sure you have the latest Widevine plugin installed. Try to toggle DRM off/on to see if that makes Firefox (re)load DRM components.

As background, Firefox uses the Widevine plugin to work with DRM (copy protected) media. The error message could be a problem with using either a too-old or a too-new version of Widevine. Since Firefox normally updates Widevine automatically in the background, this problem may go away on its own, but we are looking for leads on how to speed that up so we can share them in all the new Netflix threads.

more options

Hi rangikudoug,

Can you try the steps that @jscher2000 mentioned in following thread and let us know if it helps? https://mzl.la/3IAHsAY