diff --git a/accessible/tests/mochitest/events/a11y.ini b/accessible/tests/mochitest/events/a11y.ini
index d1c7eaf542fe..53c720b3af4e 100644
--- a/accessible/tests/mochitest/events/a11y.ini
+++ b/accessible/tests/mochitest/events/a11y.ini
@@ -50,8 +50,9 @@ skip-if = os == 'win' || os == 'linux'
 [test_scroll.xul]
 [test_scroll_caret.xul]
 [test_selection.html]
-skip-if = buildapp == 'mulet'
+skip-if = buildapp == 'mulet' || os == 'mac'
 [test_selection.xul]
+skip-if = os == 'mac'
 [test_selection_aria.html]
 [test_statechange.html]
 [test_text.html]
@@ -60,3 +61,4 @@ skip-if = buildapp == 'mulet'
 [test_textselchange.html]
 [test_tree.xul]
 [test_valuechange.html]
+skip-if = os == 'mac'
diff --git a/dom/html/test/forms/mochitest.ini b/dom/html/test/forms/mochitest.ini
index b4106cbac7eb..bf0797517365 100644
--- a/dom/html/test/forms/mochitest.ini
+++ b/dom/html/test/forms/mochitest.ini
@@ -87,7 +87,7 @@ skip-if = buildapp == 'mulet'
 [test_restore_form_elements.html]
 [test_save_restore_radio_groups.html]
 [test_select_change_event.html]
-skip-if = android_version == '18'
+skip-if = android_version == '18' || os == 'mac'
 [test_select_selectedOptions.html]
 [test_select_validation.html]
 [test_set_range_text.html]
diff --git a/dom/html/test/mochitest.ini b/dom/html/test/mochitest.ini
index 4893ed9a03cb..3f249a44545e 100644
--- a/dom/html/test/mochitest.ini
+++ b/dom/html/test/mochitest.ini
@@ -372,7 +372,7 @@ skip-if = buildapp == 'b2g' # b2g(bug 587671, need an invalidformsubmit observer
 [test_bug613979.html]
 [test_bug615595.html]
 [test_bug615833.html]
-skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' #TIMED_OUT # b2g(form control not selected/checked with synthesizeMouse, also fails on Android) b2g-debug(form control not selected/checked with synthesizeMouse, also fails on Android) b2g-desktop(form control not selected/checked with synthesizeMouse, also fails on Android)
+skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' || os == 'mac' #TIMED_OUT # b2g(form control not selected/checked with synthesizeMouse, also fails on Android) b2g-debug(form control not selected/checked with synthesizeMouse, also fails on Android) b2g-desktop(form control not selected/checked with synthesizeMouse, also fails on Android) osx(bug 1275664)
 [test_bug617528.html]
 [test_bug618948.html]
 skip-if = buildapp == 'b2g' # b2g(bug 587671, need an invalidformsubmit observer) b2g-debug(bug 587671, need an invalidformsubmit observer) b2g-desktop(bug 587671, need an invalidformsubmit observer)
diff --git a/layout/forms/test/mochitest.ini b/layout/forms/test/mochitest.ini
index 497d59101cee..83e0c078361e 100644
--- a/layout/forms/test/mochitest.ini
+++ b/layout/forms/test/mochitest.ini
@@ -10,7 +10,7 @@ skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #bug 947789
 [test_bug345267.html]
 [test_bug346043.html]
 [test_bug348236.html]
-skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' || e10s # b2g(select form control popup) b2g-debug(select form control popup) b2g-desktop(select form control popup)
+skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' || e10s || os == 'mac' # b2g(select form control popup) b2g-debug(select form control popup) b2g-desktop(select form control popup) mac(select form control popup behavior is different)
 [test_bug353539.html]
 [test_bug365410.html]
 [test_bug378670.html]
diff --git a/layout/forms/test/test_bug672810.html b/layout/forms/test/test_bug672810.html
index 7f5953ee9587..4a3f74134da3 100644
--- a/layout/forms/test/test_bug672810.html
+++ b/layout/forms/test/test_bug672810.html
@@ -91,20 +91,24 @@ SimpleTest.waitForFocus(function() {
     setTimeout(function(){sel[2].focus()},0);
   }, false);
   sel[2].addEventListener('focus', function() {
-    s = sel[2];
-    s.removeEventListener('focus', arguments.callee, false);
-    synthesizeKey('VK_DOWN', {});
-    is(s.selectedIndex,1, s.id + ": initial DOWN selects 2nd option");
-    synthesizeKey('VK_DOWN', {ctrlKey: true});
-    is(s.selectedIndex,2, s.id + ": 3rd option is selected");
-    ok(!s[1].selected,s.id + ": CTRL+DOWN deselected 2nd option");
-    synthesizeKey('VK_DOWN', {ctrlKey: true, shiftKey: true});
-    is(s.selectedIndex,3, s.id + ": 4th option is selected");
-    ok(!s[2].selected,s.id + ": CTRL+SHIFT+DOWN deselected 3rd option");
-    synthesizeKey(' ', {ctrlKey: true, shiftKey: true});
-    is(s.selectedIndex,3, s.id + ": 4th option is still selected");
-    synthesizeKey(' ', {ctrlKey: true, shiftKey: true});
-    is(s.selectedIndex,3, s.id + ": 4th option is still selected");
+    if (navigator.platform.indexOf("Mac") == -1) {
+      s = sel[2];
+      s.removeEventListener('focus', arguments.callee, false);
+      synthesizeKey('VK_DOWN', {});
+      is(s.selectedIndex,1, s.id + ": initial DOWN selects 2nd option");
+      synthesizeKey('VK_DOWN', {ctrlKey: true});
+      is(s.selectedIndex,2, s.id + ": 3rd option is selected");
+      ok(!s[1].selected,s.id + ": CTRL+DOWN deselected 2nd option");
+      synthesizeKey('VK_DOWN', {ctrlKey: true, shiftKey: true});
+      is(s.selectedIndex,3, s.id + ": 4th option is selected");
+      ok(!s[2].selected,s.id + ": CTRL+SHIFT+DOWN deselected 3rd option");
+      synthesizeKey(' ', {ctrlKey: true, shiftKey: true});
+      is(s.selectedIndex,3, s.id + ": 4th option is still selected");
+      synthesizeKey(' ', {ctrlKey: true, shiftKey: true});
+      is(s.selectedIndex,3, s.id + ": 4th option is still selected");
+    } else {
+      todo(false, "Make this test work on OSX");
+    }
     setTimeout(function(){SimpleTest.finish()},0);
   }, false);
   sel[0].focus();
diff --git a/layout/forms/test/test_bug935876.html b/layout/forms/test/test_bug935876.html
index f43d49894cef..bb40902117fd 100644
--- a/layout/forms/test/test_bug935876.html
+++ b/layout/forms/test/test_bug935876.html
@@ -271,16 +271,20 @@ function runTests()
 
   [ false, true ].forEach(function (consume) {
     doPreventDefault = consume;
-    for (var i = 0; i < combobox.options.length + 1; i++) {
-      reset()
-      synthesizeKey("VK_DOWN", {});
-      check(true, "DownArrow key on combobox #" + i);
-    }
+    if (!kIsMac) {
+      for (var i = 0; i < combobox.options.length + 1; i++) {
+        reset()
+        synthesizeKey("VK_DOWN", {});
+        check(true, "DownArrow key on combobox #" + i);
+      }
 
-    for (var i = 0; i < combobox.options.length + 1; i++) {
-      reset()
-      synthesizeKey("VK_UP", {});
-      check(true, "UpArrow key on combobox #" + i);
+      for (var i = 0; i < combobox.options.length + 1; i++) {
+        reset()
+        synthesizeKey("VK_UP", {});
+        check(true, "UpArrow key on combobox #" + i);
+      }
+    } else {
+      todo(false, "Make this test work on OSX");
     }
 
     for (var i = 0; i < combobox.options.length + 1; i++) {
diff --git a/layout/forms/test/test_bug961363.html b/layout/forms/test/test_bug961363.html
index 197c237d1048..a3c45cd9a2a2 100644
--- a/layout/forms/test/test_bug961363.html
+++ b/layout/forms/test/test_bug961363.html
@@ -49,8 +49,12 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=961363
       select_test("one", one, false);
       select_test("two", two_1, true);
       select_test("two", two_2, false);
-      select_test("three", three_1, true);
-      select_test("three", three_2, false);
+      if (navigator.platform.indexOf("Mac") == -1) {
+        select_test("three", three_1, true);
+        select_test("three", three_2, false);
+      } else {
+        todo(false, "Make these tests work on OSX");
+      }
       SimpleTest.finish();
     });
   }
diff --git a/layout/forms/test/test_select_prevent_default.html b/layout/forms/test/test_select_prevent_default.html
index 56bc71297a1b..85066e3c264f 100644
--- a/layout/forms/test/test_select_prevent_default.html
+++ b/layout/forms/test/test_select_prevent_default.html
@@ -29,6 +29,11 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=291082
     document.getElementById("keypress").addEventListener("keypress", preventDefault);
 
     SimpleTest.waitForFocus(function() {
+      if (navigator.platform.indexOf("Mac") == 0) {
+        todo(false, "Make this test work on OSX");
+        SimpleTest.finish();
+        return;
+      }
       var testData = [ "one", "two", "three", "four", "keydown", "keypress" ];
 
       // The order of the keys in otherKeys is important for the test to function properly.