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diff --git a/editor/libeditor/tests/test_bug490879.html b/editor/libeditor/tests/test_bug490879.html
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+++ b/editor/libeditor/tests/test_bug490879.html
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+<!doctype html>
+<title>Mozilla Bug 490879</title>
+<link rel=stylesheet href="/tests/SimpleTest/test.css">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=490879"
+   target="_blank">Mozilla Bug 490879</a>
+<iframe id="i1" width="200" height="100" src="about:blank"></iframe>
+<img id="i" src="green.png">
+<script>
+function runTest() {
+  function verifyContent() {
+    const kExpectedImgSpec = "data:image/png;base64,";
+    var e = document.getElementById('i1');
+    var doc = e.contentDocument;
+    is(doc.getElementsByTagName("img")[0].src.substring(0, kExpectedImgSpec.length),
+       kExpectedImgSpec, "The pasted image is a base64-encoded data: URI");
+  }
+
+  function pasteInto() {
+    var e = document.getElementById('i1');
+    var doc = e.contentDocument;
+    doc.designMode = "on";
+    doc.defaultView.focus();
+    var selection = doc.defaultView.getSelection();
+    selection.removeAllRanges();
+    selection.selectAllChildren(doc.body);
+    selection.collapseToEnd();
+    SpecialPowers.doCommand(window, "cmd_paste");
+  }
+
+  function copyToClipBoard() {
+    SpecialPowers.setCommandNode(window, document.getElementById("i"));
+    SpecialPowers.doCommand(window, "cmd_copyImageContents");
+  }
+
+  copyToClipBoard();
+  pasteInto();
+  verifyContent();
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+</script>