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diff --git a/toolkit/components/places/tests/favicons/test_favicons_conversions.js b/toolkit/components/places/tests/favicons/test_favicons_conversions.js
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+++ b/toolkit/components/places/tests/favicons/test_favicons_conversions.js
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+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This file tests the image conversions done by the favicon service.
+ */
+
+// Globals
+
+// The pixel values we get on Windows are sometimes +/- 1 value compared to
+// other platforms, so we need to skip some image content tests.
+var isWindows = "@mozilla.org/windows-registry-key;1" in Cc;
+
+/**
+ * Checks the conversion of the given test image file.
+ *
+ * @param aFileName
+ *        File that contains the favicon image, located in the test folder.
+ * @param aFileMimeType
+ *        MIME type of the image contained in the file.
+ * @param aFileLength
+ *        Expected length of the file.
+ * @param aExpectConversion
+ *        If false, the icon should be stored as is.  If true, the expected data
+ *        is loaded from a file named "expected-" + aFileName + ".png".
+ * @param aVaryOnWindows
+ *        Indicates that the content of the converted image can be different on
+ *        Windows and should not be checked on that platform.
+ * @param aCallback
+ *        This function is called after the check finished.
+ */
+async function checkFaviconDataConversion(
+  aFileName,
+  aFileMimeType,
+  aFileLength,
+  aExpectConversion,
+  aVaryOnWindows
+) {
+  let pageURI = NetUtil.newURI("http://places.test/page/" + aFileName);
+  await PlacesTestUtils.addVisits({
+    uri: pageURI,
+    transition: TRANSITION_TYPED,
+  });
+  let faviconURI = NetUtil.newURI("http://places.test/icon/" + aFileName);
+  let fileData = readFileOfLength(aFileName, aFileLength);
+
+  PlacesUtils.favicons.replaceFaviconData(faviconURI, fileData, aFileMimeType);
+  await new Promise(resolve => {
+    PlacesUtils.favicons.setAndFetchFaviconForPage(
+      pageURI,
+      faviconURI,
+      true,
+      PlacesUtils.favicons.FAVICON_LOAD_NON_PRIVATE,
+      (aURI, aDataLen, aData, aMimeType) => {
+        if (!aExpectConversion) {
+          Assert.ok(compareArrays(aData, fileData));
+          Assert.equal(aMimeType, aFileMimeType);
+        } else {
+          if (!aVaryOnWindows || !isWindows) {
+            let expectedFile = do_get_file("expected-" + aFileName + ".png");
+            Assert.ok(compareArrays(aData, readFileData(expectedFile)));
+          }
+          Assert.equal(aMimeType, "image/png");
+        }
+        resolve();
+      },
+      Services.scriptSecurityManager.getSystemPrincipal()
+    );
+  });
+}
+
+add_task(async function test_storing_a_normal_16x16_icon() {
+  // 16x16 png, 286 bytes.
+  // optimized: no
+  await checkFaviconDataConversion(
+    "favicon-normal16.png",
+    "image/png",
+    286,
+    false,
+    false
+  );
+});
+
+add_task(async function test_storing_a_normal_32x32_icon() {
+  // 32x32 png, 344 bytes.
+  // optimized: no
+  await checkFaviconDataConversion(
+    "favicon-normal32.png",
+    "image/png",
+    344,
+    false,
+    false
+  );
+});
+
+add_task(async function test_storing_a_big_16x16_icon() {
+  //  in: 16x16 ico, 1406 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-big16.ico",
+    "image/x-icon",
+    1406,
+    true,
+    false
+  );
+});
+
+add_task(async function test_storing_an_oversize_4x4_icon() {
+  //  in: 4x4 jpg, 4751 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-big4.jpg",
+    "image/jpeg",
+    4751,
+    true,
+    false
+  );
+});
+
+add_task(async function test_storing_an_oversize_32x32_icon() {
+  //  in: 32x32 jpg, 3494 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-big32.jpg",
+    "image/jpeg",
+    3494,
+    true,
+    true
+  );
+});
+
+add_task(async function test_storing_an_oversize_48x48_icon() {
+  //  in: 48x48 ico, 56646 bytes.
+  // (howstuffworks.com icon, contains 13 icons with sizes from 16x16 to
+  // 48x48 in varying depths)
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-big48.ico",
+    "image/x-icon",
+    56646,
+    true,
+    false
+  );
+});
+
+add_task(async function test_storing_an_oversize_64x64_icon() {
+  //  in: 64x64 png, 10698 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-big64.png",
+    "image/png",
+    10698,
+    true,
+    false
+  );
+});
+
+add_task(async function test_scaling_an_oversize_160x3_icon() {
+  //  in: 160x3 jpg, 5095 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-scale160x3.jpg",
+    "image/jpeg",
+    5095,
+    true,
+    false
+  );
+});
+
+add_task(async function test_scaling_an_oversize_3x160_icon() {
+  //  in: 3x160 jpg, 5059 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-scale3x160.jpg",
+    "image/jpeg",
+    5059,
+    true,
+    false
+  );
+});
+
+add_task(async function test_animated_16x16_icon() {
+  // in: 16x16 apng, 1791 bytes.
+  // optimized: yes
+  await checkFaviconDataConversion(
+    "favicon-animated16.png",
+    "image/png",
+    1791,
+    true,
+    false
+  );
+});