Try to toggle DRM off/on to see if that makes Firefox load these components.

• Options/Preferences -> Content: Play DRM

What do you see in about:addons -> Plugins?

There are 3 add on all up to date ...

 no yellow or red messages

I tried toggle DRM . just gave me another message

Thank you!!!!

I have same problem. Windows 7 Pro at current service levels. Firefox is 54.0.1 (32-bit). Tried toggling DRM, uninstalling all anti-virus software, disabled all plug-ins, disabled all extensions except for Roboform Password Manager.

What is there left to try?

You can check the gmp folders in the profile folder if they contain files then try to (re)move these folders to see if that has effect.

You can also check the gmp related prefs on the about:config page. You can open "about:" pages via the location/address bar

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

I've got the same problem here, on Linux, with a custom kernel.

Apparently enabling CONFIG_SECCOMP in kernel config made it working (unless it has been due to a weird coincidence)..

I posting this here so hopefully: 1) Other users hitting my same problem could fix it. 2) FF developers could maybe add a meaningful error message that gives some clues..

Currently experiencing this issue - have we got a fix?