Yes, with DRM. You can check if it's used by looking at the address bar: https://blog.mozilla.org/blog/2015/05/12/update-on-digital-rights-management-and-firefo

Yes, with DRM. You can check if it's used by looking at the address bar: https://blog.mozilla.org/blog/2015/05/12/update-on-digital-rights-management-and-firefox/ https://blog.mozilla.org/blog/2015/05/12/update-on-digital-r...