Firefox - if you don't use DRM and have no plan on ever using or enabling DRM, disable the pop-in which occurs when visiting any DRM-infected website by adding to your user.js / prefs.js (about:config)

  user_pref("media.gmp-widevinecdm.enabled", false);
  user_pref("media.gmp-widevinecdm.visible", false);

#firefox #opensource #linux