diff --git a/dom/base/nsImageLoadingContent.cpp b/dom/base/nsImageLoadingContent.cpp
index 7fcb865b4cde..4e48fe10e05e 100644
--- a/dom/base/nsImageLoadingContent.cpp
+++ b/dom/base/nsImageLoadingContent.cpp
@@ -1211,7 +1211,10 @@ nsresult nsImageLoadingContent::LoadImage(nsIURI* aNewURI, bool aForce,
     MOZ_ASSERT(!req, "Shouldn't have non-null request here");
     // If we don't have a current URI, we might as well store this URI so people
     // know what we tried (and failed) to load.
-    if (!mCurrentRequest) mCurrentURI = aNewURI;
+    if (!mCurrentRequest) {
+      mCurrentURI = aNewURI;
+      mImageBlockingStatus = nsIContentPolicy::REJECT_REQUEST;
+    }
 
     FireEvent(u"error"_ns);
     FireEvent(u"loadend"_ns);
diff --git a/layout/reftests/image/reftest.list b/layout/reftests/image/reftest.list
index a8a91c13ed3a..3c561fe3a7c8 100644
--- a/layout/reftests/image/reftest.list
+++ b/layout/reftests/image/reftest.list
@@ -69,3 +69,4 @@ random-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)) == image-srcset-basic-selec
 pref(dom.image-lazy-loading.enabled,true) == moz-broken-matching-lazy-load.html moz-broken-matching-1-ref.html
 
 == img-invalidation-local-transform-1.html img-invalidation-local-transform-1-ref.html
+== unknown-protocol.html unknown-protocol-ref.html
diff --git a/layout/reftests/image/unknown-protocol-ref.html b/layout/reftests/image/unknown-protocol-ref.html
new file mode 100644
index 000000000000..b5bb326eef57
--- /dev/null
+++ b/layout/reftests/image/unknown-protocol-ref.html
@@ -0,0 +1 @@
+<img src="mailto://foo">
diff --git a/layout/reftests/image/unknown-protocol.html b/layout/reftests/image/unknown-protocol.html
new file mode 100644
index 000000000000..ef06881b7bcb
--- /dev/null
+++ b/layout/reftests/image/unknown-protocol.html
@@ -0,0 +1 @@
+<img src="foobar://baz">