--- a/toolkit/modules/GMPUtils.jsm
+++ b/toolkit/modules/GMPUtils.jsm
@@ -74,18 +74,19 @@ this.GMPUtils = {
       return true;
     }
     if (aPlugin.id == EME_ADOBE_ID) {
       if (Services.appinfo.OS != "WINNT") {
         // Non-Windows OSes currently unsupported by Adobe EME
         this.maybeReportTelemetry(aPlugin.id,
                                   "VIDEO_EME_ADOBE_UNSUPPORTED_REASON",
                                   GMPPluginUnsupportedReason.NOT_WINDOWS);
-        return false;
       }
+      // Windows Vista and later only supported by Adobe EME.
+      return AppConstants.isPlatformAndVersionAtLeast("win", "6");
     } else if (aPlugin.id == WIDEVINE_ID) {
       // The Widevine plugin is available for Windows versions Vista and later
       // and Mac OSX 10.7 and later.
       if (AppConstants.isPlatformAndVersionAtLeast("win", "6") ||
           AppConstants.isPlatformAndVersionAtLeast("macosx", "10.7")) {
         return true;
       }
       return false;