diff --git a/image/test/reftest/downscaling/downscale-moz-icon-1-ref.html b/image/test/reftest/downscaling/downscale-moz-icon-1-ref.html
new file mode 100644
index 000000000000..ade5e219298d
--- /dev/null
+++ b/image/test/reftest/downscaling/downscale-moz-icon-1-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+<html class="reftest-wait">
+<head>
+  <meta charset="utf-8" />
+  <title>Reference for downscaling moz-icon images (bug 1261964)</title>
+  <script>
+    function beginTest() {
+      var canvas = document.getElementById("canvas");
+      var ctx = canvas.getContext("2d");
+      var image = new Image();
+
+      image.onload = function() {
+        // When image loads: draw it to canvas, scale down the canvas, and
+        // then let the reftest snapshot happen.
+        ctx.drawImage(image, 0, 0);
+        canvas.setAttribute("class", "downscale");
+        document.documentElement.removeAttribute("class");
+      }
+
+      // Kick off the image load:
+      image.src = "moz-icon://bogus-unrecognized-icon?size=100";
+    }
+  </script>
+  <style>
+    body { margin: 0; }
+    .downscale {
+      transform-origin: 0 0;
+      transform: scale(0.9);
+    }
+  </style>
+</head>
+<body onload="beginTest()">
+  <canvas id="canvas" height="100px" width="100px"></canvas>
+</body>
+</html>
diff --git a/image/test/reftest/downscaling/downscale-moz-icon-1.html b/image/test/reftest/downscaling/downscale-moz-icon-1.html
new file mode 100644
index 000000000000..ba379512741f
--- /dev/null
+++ b/image/test/reftest/downscaling/downscale-moz-icon-1.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>Testcase for downscaling moz-icon images (bug 1261964)</title>
+  <style>
+    body { margin: 0; }
+    .downscale {
+      transform-origin: 0 0;
+      transform: scale(0.9);
+    }
+  </style>
+</head>
+<body>
+  <img class="downscale" src="moz-icon://bogus-unrecognized-icon?size=100">
+</body>
+</html>
diff --git a/image/test/reftest/downscaling/reftest.list b/image/test/reftest/downscaling/reftest.list
index 125d7a92247e..6b3e221cd056 100644
--- a/image/test/reftest/downscaling/reftest.list
+++ b/image/test/reftest/downscaling/reftest.list
@@ -87,6 +87,8 @@ fuzzy(20,999) != downscale-2c.html?205,53,bottom about:blank
 fuzzy(20,999) != downscale-2d.html?205,53,bottom about:blank
 fuzzy(20,999) fails-if(OSX>=1008&&!skiaContent) != downscale-2e.html?205,53,bottom about:blank
 
+fuzzy(28,3386) == downscale-moz-icon-1.html downscale-moz-icon-1-ref.html
+
 == downscale-png.html?16,16,interlaced downscale-png.html?16,16,normal
 == downscale-png.html?24,24,interlaced downscale-png.html?24,24,normal
 
@@ -168,6 +170,8 @@ fuzzy(20,999) != downscale-2d.html?205,53,bottom about:blank
 fuzzy(20,999) != downscale-2e.html?205,53,bottom about:blank
 fuzzy(20,999) != downscale-2f.html?205,53,bottom about:blank
 
+fuzzy(36,4439) == downscale-moz-icon-1.html downscale-moz-icon-1-ref.html
+
 == downscale-png.html?16,16,interlaced downscale-png.html?16,16,normal
 == downscale-png.html?24,24,interlaced downscale-png.html?24,24,normal
 
