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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
new file mode 100644
index 000000000..fa0d332ec
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+++ b/toolkit/components/places/tests/favicons/test_favicons_conversions.js
@@ -0,0 +1,131 @@
+/* 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.
+ */
+function checkFaviconDataConversion(aFileName, aFileMimeType, aFileLength,
+                                    aExpectConversion, aVaryOnWindows,
+                                    aCallback) {
+  let pageURI = NetUtil.newURI("http://places.test/page/" + aFileName);
+  PlacesTestUtils.addVisits({ uri: pageURI, transition: TRANSITION_TYPED }).then(
+    function () {
+      let faviconURI = NetUtil.newURI("http://places.test/icon/" + aFileName);
+      let fileData = readFileOfLength(aFileName, aFileLength);
+
+      PlacesUtils.favicons.replaceFaviconData(faviconURI, fileData, fileData.length,
+                                              aFileMimeType);
+      PlacesUtils.favicons.setAndFetchFaviconForPage(pageURI, faviconURI, true,
+        PlacesUtils.favicons.FAVICON_LOAD_NON_PRIVATE,
+        function CFDC_verify(aURI, aDataLen, aData, aMimeType) {
+          if (!aExpectConversion) {
+            do_check_true(compareArrays(aData, fileData));
+            do_check_eq(aMimeType, aFileMimeType);
+          } else {
+            if (!aVaryOnWindows || !isWindows) {
+              let expectedFile = do_get_file("expected-" + aFileName + ".png");
+              do_check_true(compareArrays(aData, readFileData(expectedFile)));
+            }
+            do_check_eq(aMimeType, "image/png");
+          }
+
+          aCallback();
+        }, Services.scriptSecurityManager.getSystemPrincipal());
+    });
+}
+
+// Tests
+
+function run_test() {
+  run_next_test();
+}
+
+add_test(function test_storing_a_normal_16x16_icon() {
+  // 16x16 png, 286 bytes.
+  // optimized: no
+  checkFaviconDataConversion("favicon-normal16.png", "image/png", 286,
+                             false, false, run_next_test);
+});
+
+add_test(function test_storing_a_normal_32x32_icon() {
+  // 32x32 png, 344 bytes.
+  // optimized: no
+  checkFaviconDataConversion("favicon-normal32.png", "image/png", 344,
+                             false, false, run_next_test);
+});
+
+add_test(function test_storing_a_big_16x16_icon() {
+  //  in: 16x16 ico, 1406 bytes.
+  // optimized: no
+  checkFaviconDataConversion("favicon-big16.ico", "image/x-icon", 1406,
+                             false, false, run_next_test);
+});
+
+add_test(function test_storing_an_oversize_4x4_icon() {
+  //  in: 4x4 jpg, 4751 bytes.
+  // optimized: yes
+  checkFaviconDataConversion("favicon-big4.jpg", "image/jpeg", 4751,
+                             true, false, run_next_test);
+});
+
+add_test(function test_storing_an_oversize_32x32_icon() {
+  //  in: 32x32 jpg, 3494 bytes.
+  // optimized: yes
+  checkFaviconDataConversion("favicon-big32.jpg", "image/jpeg", 3494,
+                             true, true, run_next_test);
+});
+
+add_test(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
+  checkFaviconDataConversion("favicon-big48.ico", "image/x-icon", 56646,
+                             true, false, run_next_test);
+});
+
+add_test(function test_storing_an_oversize_64x64_icon() {
+  //  in: 64x64 png, 10698 bytes.
+  // optimized: yes
+  checkFaviconDataConversion("favicon-big64.png", "image/png", 10698,
+                             true, false, run_next_test);
+});
+
+add_test(function test_scaling_an_oversize_160x3_icon() {
+  //  in: 160x3 jpg, 5095 bytes.
+  // optimized: yes
+  checkFaviconDataConversion("favicon-scale160x3.jpg", "image/jpeg", 5095,
+                             true, false, run_next_test);
+});
+
+add_test(function test_scaling_an_oversize_3x160_icon() {
+  //  in: 3x160 jpg, 5059 bytes.
+  // optimized: yes
+  checkFaviconDataConversion("favicon-scale3x160.jpg", "image/jpeg", 5059,
+                             true, false, run_next_test);
+});