diff --git a/toolkit/themes/osx/global/button.css b/toolkit/themes/osx/global/button.css
index f908c6bfce9c..901aa11181e7 100644
--- a/toolkit/themes/osx/global/button.css
+++ b/toolkit/themes/osx/global/button.css
@@ -64,36 +64,6 @@ button.plain {
 /* ::::: help button ::::: */
 
 button[dlgtype="help"] {
-  min-width: 1px;
-  padding: 0;
-  -moz-appearance: none;
-  -moz-box-align: start;
-  height: 24px;
-  width: 24px;
-  margin: 3px 4px;
-}
-
-button[dlgtype="help"][disabled] {
-  opacity: 0.5;
-}
-
-button[dlgtype="help"]:-moz-focusring {
-  outline: 2px solid -moz-mac-focusring;
-  outline-offset: -2px;
-  -moz-outline-radius: 10000px;
-}
-
-button[dlgtype="help"] > .button-box > .button-icon {
-  list-style-image: url("chrome://global/skin/icons/question-mark.png");
-  -moz-image-region: rect(0 24px 24px 0);
-  padding: 0;
-  margin: 0;
-}
-
-button[dlgtype="help"]:active > .button-box > .button-icon {
-  -moz-image-region: rect(0 48px 24px 24px);
-}
-
-button[dlgtype="help"] > .button-box > .button-text {
-  display: none;
+  -moz-appearance: -moz-mac-help-button;
+  width: 20px;
 }
diff --git a/toolkit/themes/osx/global/icons/question-mark.png b/toolkit/themes/osx/global/icons/question-mark.png
deleted file mode 100644
index bd7689f534d2..000000000000
Binary files a/toolkit/themes/osx/global/icons/question-mark.png and /dev/null differ
diff --git a/toolkit/themes/osx/global/jar.mn b/toolkit/themes/osx/global/jar.mn
index 1b5d9372e090..8296fd1be36d 100644
--- a/toolkit/themes/osx/global/jar.mn
+++ b/toolkit/themes/osx/global/jar.mn
@@ -114,7 +114,6 @@ toolkit.jar:
   skin/classic/global/icons/panebutton-active.png                    (icons/panebutton-active.png)
   skin/classic/global/icons/panebutton-inactive.png                  (icons/panebutton-inactive.png)
   skin/classic/global/icons/panel-dropmarker.png                     (icons/panel-dropmarker.png)
-  skin/classic/global/icons/question-mark.png                        (icons/question-mark.png)
   skin/classic/global/icons/resizer.png                              (icons/resizer.png)
   skin/classic/global/icons/resizer@2x.png                           (icons/resizer@2x.png)
   skin/classic/global/icons/resizer-rtl.png                          (icons/resizer-rtl.png)
diff --git a/toolkit/themes/osx/global/preferences.css b/toolkit/themes/osx/global/preferences.css
index 3a8b4d1ca150..d0b82a819cca 100644
--- a/toolkit/themes/osx/global/preferences.css
+++ b/toolkit/themes/osx/global/preferences.css
@@ -18,7 +18,7 @@ prefwindow[type="child"] > prefpane {
 }
 
 .prefWindow-dlgbuttons {
-  margin: 0 12px 8px;
+  margin: 0 12px 12px;
   padding-top: 0 !important;
 }