Show the issue and provide screenshots. I have no issue with trailers. see screenshot Did you try Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search104

I did enter the new Troubleshooter Mode and I was able to watch the videos! But how can I solve the problem in the normal Firefox mode? Thanks!

Make sure your browsers are supported to stream Paramount+. Clear your browser's cache, cookies and browsing history. Close your browser and open a new browser window. Try a different browser (like Google Chrome, Mozilla Firefox, Safari, Microsoft Edge).

Regards, Jimmt

This is of no help at all. Did you read my response to Jonz? If I enter Troubleshooting Mode, I can play the videos on Paramount Plus. So how can I do this in standard Firefox?

This link may tell you or, at least, get you started.

https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_the-problem-does-not-happen-in-troubleshoot-mode

Try disabling your extensions.

See also:

• https://www.google.com/search?sa=N&num=100&q=Paramount%20Plus%20Error%203005

I did enter the new Troubleshooter Mode and I was able to watch the videos! But how can I solve the problem in the normal Firefox mode? Thanks!

This is why screenshots are important. It sounds like an add-on is the issue, but we cannot see your browser. You will have to play detective and disable your add-ons 1 by 1 to see which on is causing the issue. May the Schwartz be with you. ;-))

OK - here is a screenshot. There exists a basic conflict between Firefox and Paramount. Both Edge and Chrome handle Paramount just fine!

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings) or click the padlock icon (Clear cookies and site data) for the domain in the selected tab.

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

You can check for issues with Enhanced Tracking Protection. Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

• click the shield icon for more detail and possibly disable the protection

You can check the Web Console for relevant-looking messages like blocked content.

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

I did enter the new Troubleshooter Mode and I was able to watch the videos! But how can I solve the problem in the normal Firefox mode?

Disable hardware acceleration and disable your extensions.