diff --git a/dom/media/VideoFrameContainer.cpp b/dom/media/VideoFrameContainer.cpp
index 22ecb995094..f7471cdcca2 100644
--- a/dom/media/VideoFrameContainer.cpp
+++ b/dom/media/VideoFrameContainer.cpp
@@ -152,18 +152,13 @@ void VideoFrameContainer::SetCurrentFramesLocked(
   mImageContainer->GetCurrentImages(&oldImages);
 
   PrincipalHandle principalHandle = PRINCIPAL_HANDLE_NONE;
-  ImageContainer::FrameID lastFrameIDForOldPrincipalHandle =
-      mFrameIDForPendingPrincipalHandle - 1;
   if (mPendingPrincipalHandle != PRINCIPAL_HANDLE_NONE &&
-      ((!oldImages.IsEmpty() &&
-        oldImages.LastElement().mFrameID >= lastFrameIDForOldPrincipalHandle) ||
-       (!aImages.IsEmpty() &&
-        aImages[0].mFrameID > lastFrameIDForOldPrincipalHandle))) {
-    // We are releasing the last FrameID prior to
-    // `lastFrameIDForOldPrincipalHandle` OR there are no FrameIDs prior to
-    // `lastFrameIDForOldPrincipalHandle` in the new set of images. This means
-    // that the old principal handle has been flushed out and we can notify our
-    // video element about this change.
+      (aImages.IsEmpty() ||
+       aImages[0].mFrameID >= mFrameIDForPendingPrincipalHandle)) {
+    // There are no FrameIDs prior to `mFrameIDForPendingPrincipalHandle`
+    // in the new set of images.
+    // This means that the old principal handle has been flushed out and we
+    // can notify our video element about this change.
     principalHandle = mPendingPrincipalHandle;
     mLastPrincipalHandle = mPendingPrincipalHandle;
     mPendingPrincipalHandle = PRINCIPAL_HANDLE_NONE;