--- a/dom/media/gmp/GMPParent.cpp
+++ b/dom/media/gmp/GMPParent.cpp
@@ -7,16 +7,17 @@
 #include "mozilla/Logging.h"
 #include "nsComponentManagerUtils.h"
 #include "nsComponentManagerUtils.h"
 #include "nsThreadUtils.h"
 #include "nsIRunnable.h"
 #include "nsIWritablePropertyBag2.h"
 #include "mozIGeckoMediaPluginService.h"
 #include "mozilla/ipc/GeckoChildProcessHost.h"
+#include "mozilla/SSE.h"
 #include "mozilla/SyncRunnable.h"
 #include "mozilla/unused.h"
 #include "nsIObserverService.h"
 #include "GMPTimerParent.h"
 #include "runnable_utils.h"
 #if defined(XP_LINUX) && defined(MOZ_GMP_SANDBOX)
 #include "mozilla/SandboxInfo.h"
 #endif
@@ -829,16 +830,30 @@ GMPParent::ReadGMPMetaData()
       if (!mozilla::SandboxInfo::Get().CanSandboxMedia()) {
         printf_stderr("GMPParent::ReadGMPMetaData: Plugin \"%s\" is an EME CDM"
                       " but this system can't sandbox it; not loading.\n",
                       mDisplayName.get());
         delete cap;
         return NS_ERROR_FAILURE;
       }
 #endif
+#ifdef XP_WIN
+      // Adobe GMP doesn't work without SSE2. Check the tags to see if
+      // the decryptor is for the Adobe GMP, and refuse to load it if
+      // SSE2 isn't supported.
+      for (const nsCString& tag : cap->mAPITags) {
+        if (!tag.EqualsLiteral("com.adobe.primetime")) {
+          continue;
+        }
+        if (!mozilla::supports_sse2()) {
+          return NS_ERROR_FAILURE;
+        }
+        break;
+      }
+#endif // XP_WIN
     }
 
     mCapabilities.AppendElement(cap);
   }
 
   if (mCapabilities.IsEmpty()) {
     return NS_ERROR_FAILURE;
   }