So google won't let you use there DRM. Firefox doesn't support this.
Don't allow DRM sources hulu/netflix otherwise make a deal with each company. Your problem is with the video providers not a third party who has a solution you want to use.
"Firefox for desktop supports the Google Widevine CDM for playing DRM-controlled content. Firefox downloads and enables the Google Widevine CDM by default to give users a smooth experience on sites that require DRM."
Don't allow DRM sources hulu/netflix otherwise make a deal with each company. Your problem is with the video providers not a third party who has a solution you want to use.