hello Good morning Gabriel Verdún Fernández, '''follow the steps and instruction resolve your problem easily :''' 1. Turn off private browsing * Close the Firefox browser and reopen it. * Try Netflix again. 2. Enable cookies in Firefox * Select the 3 horizontal line from the upper right corner. * Select Options. * Select Privacy & Security from the menu on the left. * Under History, locate the Firefox will: drop-down menu and select Remember history. * Close the tab and try Netflix again. 3. Ensure DRM content is enabled * Select the 3 horizontal line upper right corner of your browser. * Select Options. * Select Content from the menu on the left. * If you do not see Content, select General and scroll down to Digital Rights Management (DRM) Content. * Uncheck, then recheck the box next to Play DRM content. * If the box next to Play DRM content was not checked, check it before continuing. * Restart Firefox and try Netflix again. 4. Update Firefox's content protection feature * Select the 3 horizontal line from the upper right corner of your browser. * Select Addons. * Navigate to the Plugins tab. * Find the Widevine Content Decryption Module provided by Google, Inc., right-click on it, and select Find Updates. * If you see the message Widevine Content Decryption Module provided by Google, Inc will be installed shortly, you may need to wait a moment for it to install. * Ensure Always Activate is selected from the drop-down menu next to the Widevine Content Decryption Module. * Try Netflix again. i hope resolved your problem then reply back to me and mark solution . Thank you and Regards, Arman khan