diff --git a/dom/media/eme/MediaKeySystemAccess.cpp b/dom/media/eme/MediaKeySystemAccess.cpp
index 7e5194ea5e94..fae0e65cdd76 100644
--- a/dom/media/eme/MediaKeySystemAccess.cpp
+++ b/dom/media/eme/MediaKeySystemAccess.cpp
@@ -103,6 +103,10 @@ EnsureMinCDMVersion(mozIGeckoMediaPluginService* aGMPService,
   tags.AppendElement(NS_ConvertUTF16toUTF8(aKeySystem));
   nsAutoCString versionStr;
   if (NS_FAILED(aGMPService->GetPluginVersionForAPI(NS_LITERAL_CSTRING(GMP_API_DECRYPTOR),
+                                                    &tags,
+                                                    versionStr)) &&
+      // XXX to be removed later in bug 1147692
+      NS_FAILED(aGMPService->GetPluginVersionForAPI(NS_LITERAL_CSTRING(GMP_API_DECRYPTOR_COMPAT),
                                                     &tags,
                                                     versionStr))) {
     return MediaKeySystemStatus::Error;
@@ -153,7 +157,11 @@ MediaKeySystemAccess::GetKeySystemStatus(const nsAString& aKeySystem,
     }
     if (!HaveGMPFor(mps,
                     NS_ConvertUTF16toUTF8(aKeySystem),
-                    NS_LITERAL_CSTRING(GMP_API_DECRYPTOR))) {
+                    NS_LITERAL_CSTRING(GMP_API_DECRYPTOR)) &&
+        // XXX to be removed later in bug 1147692
+        !HaveGMPFor(mps,
+                    NS_ConvertUTF16toUTF8(aKeySystem),
+                    NS_LITERAL_CSTRING(GMP_API_DECRYPTOR_COMPAT))) {
       return MediaKeySystemStatus::Cdm_not_installed;
     }
     return EnsureMinCDMVersion(mps, aKeySystem, aMinCdmVersion);
@@ -197,14 +205,26 @@ IsPlayableWithGMP(mozIGeckoMediaPluginService* aGMPS,
       hasMP3) {
     return false;
   }
-  return (!hasAAC || !HaveGMPFor(aGMPS,
-                                 NS_ConvertUTF16toUTF8(aKeySystem),
-                                 NS_LITERAL_CSTRING(GMP_API_DECRYPTOR),
-                                 NS_LITERAL_CSTRING("aac"))) &&
-         (!hasH264 || !HaveGMPFor(aGMPS,
-                                  NS_ConvertUTF16toUTF8(aKeySystem),
-                                  NS_LITERAL_CSTRING(GMP_API_DECRYPTOR),
-                                  NS_LITERAL_CSTRING("h264")));
+  return (!hasAAC ||
+          !(HaveGMPFor(aGMPS,
+                       NS_ConvertUTF16toUTF8(aKeySystem),
+                       NS_LITERAL_CSTRING(GMP_API_DECRYPTOR),
+                       NS_LITERAL_CSTRING("aac")) ||
+            // XXX remove later in bug 1147692
+            HaveGMPFor(aGMPS,
+                       NS_ConvertUTF16toUTF8(aKeySystem),
+                       NS_LITERAL_CSTRING(GMP_API_DECRYPTOR_COMPAT),
+                       NS_LITERAL_CSTRING("aac")))) &&
+         (!hasH264 ||
+          !(HaveGMPFor(aGMPS,
+                       NS_ConvertUTF16toUTF8(aKeySystem),
+                       NS_LITERAL_CSTRING(GMP_API_DECRYPTOR),
+                       NS_LITERAL_CSTRING("h264")) ||
+            // XXX remove later in bug 1147692
+            HaveGMPFor(aGMPS,
+                       NS_ConvertUTF16toUTF8(aKeySystem),
+                       NS_LITERAL_CSTRING(GMP_API_DECRYPTOR_COMPAT),
+                       NS_LITERAL_CSTRING("h264"))));
 #else
   return false;
 #endif
diff --git a/dom/media/gmp/GMPChild.cpp b/dom/media/gmp/GMPChild.cpp
index c68906f7b688..3700271f5c45 100644
--- a/dom/media/gmp/GMPChild.cpp
+++ b/dom/media/gmp/GMPChild.cpp
@@ -629,6 +629,12 @@ GMPChild::RecvPGMPDecryptorConstructor(PGMPDecryptorChild* aActor)
 
   void* session = nullptr;
   GMPErr err = GetAPI(GMP_API_DECRYPTOR, host, &session);
+
+  if (err != GMPNoErr && !session) {
+    // XXX to remove in bug 1147692
+    err = GetAPI(GMP_API_DECRYPTOR_COMPAT, host, &session);
+  }
+
   if (err != GMPNoErr || !session) {
     return false;
   }
diff --git a/dom/media/gmp/GMPService.cpp b/dom/media/gmp/GMPService.cpp
index d05d704d8a77..d628f77aab90 100644
--- a/dom/media/gmp/GMPService.cpp
+++ b/dom/media/gmp/GMPService.cpp
@@ -602,6 +602,14 @@ GeckoMediaPluginService::GetGMPDecryptor(nsTArray<nsCString>* aTags,
   nsRefPtr<GMPParent> gmp = SelectPluginForAPI(aNodeId,
                                                NS_LITERAL_CSTRING(GMP_API_DECRYPTOR),
                                                *aTags);
+
+  if (!gmp) {
+    // XXX to remove in bug 1147692
+    gmp = SelectPluginForAPI(aNodeId,
+                             NS_LITERAL_CSTRING(GMP_API_DECRYPTOR_COMPAT),
+                             *aTags);
+  }
+
   if (!gmp) {
     return NS_ERROR_FAILURE;
   }
diff --git a/dom/media/gmp/gmp-api/gmp-decryption.h b/dom/media/gmp/gmp-api/gmp-decryption.h
index bb111227567b..f732fc3feb68 100644
--- a/dom/media/gmp/gmp-api/gmp-decryption.h
+++ b/dom/media/gmp/gmp-api/gmp-decryption.h
@@ -240,6 +240,9 @@ enum GMPSessionType {
 
 #define GMP_API_DECRYPTOR "eme-decrypt-v7"
 
+// XXX remove in bug 1147692
+#define GMP_API_DECRYPTOR_COMPAT "eme-decrypt-v6"
+
 // API exposed by plugin library to manage decryption sessions.
 // When the Host requests this by calling GMPGetAPIFunc().
 //