It is not malware. I am running FF41 and Win10 unfortunately.
Here is what it says when the Learn More is clicked-
Watch DRM content on Firefox
Digital Rights Management (DRM) is technology that enables online video and audio services to enforce that the content they provide is used in accordance with their requirements. This technology may restrict some of the things you can do in the browser. While some DRM-controlled content can be viewed using the Microsoft Silverlight and Adobe Flash plugins, many services are moving towards HTML5 video that requires a different DRM mechanism called a Content Decryption Module (CDM).
Beginning in version 38, Firefox desktop supports HTML5 playback of DRM-controlled video and audio through the Adobe Primetime CDM. This CDM implements a DRM system called Adobe Primetime, which was previously available via the Adobe Flash plugin.
Firefox downloads and enables the Adobe Primetime CDM by default to give users a smooth experience on sites that require DRM. The CDM runs in a separate container called a sandbox and you will be notified when the CDM is in use. You can also disable the CDM and opt out of future updates by following the steps below. Once you disable the CDM, however, sites using this type of DRM may not operate properly.
Some sites may use DRM that is not supported by Adobe Primetime CDM. Support for viewing this content may require a third-party plugin.