Hi sta2109,

Here's an easier method to re-install Widevine:

Type or paste about:support in the address bar Press Enter Under Application Basics Next to Profile Folder Click the Open Folder button Close Firefox

In your Profile Folder find the folder gmp-widevinecdm Move it to your desktop

Start Firefox A new WidevineDRM module will install Go to Add-ons/Plugins and Check For Updates

You can delete the gmp-widevinecdm folder on your desktop.

Did like you said and it doesn't install I'm having "Widevine Content Decryption Module provided by Google Inc. will be installed shortly." even reinstall didn't helped

Never mind i misspelled one word in about:config that's why didn't work manually. Thanks for you help anyway owo