Remove the MNG image decoder from the build, replace the MNG throbbers with animated gifs.

mail/app/profile/mailnews.js

@@ -337,7 +337,7 @@ pref("mail.server.default.delete_mail_left_on_server", false);
 pref("mail.server.default.valid", true);
 pref("mail.server.default.abbreviate",true);
 pref("mail.server.default.isSecure", false);
-pref("mail.server.default.useSecAuth", false);
+pref("mail.server.default.useSecAuth", true);
 pref("mail.server.default.override_namespaces", true);
 
 pref("mail.server.default.delete_model", 1);

mail/base/jar.mn

@@ -31,8 +31,8 @@ classic.jar:
     skin/classic/messenger/icons/mail-toolbar-small.png  (skin/icons/mail-toolbar-small.png)
 +   skin/classic/communicator/alerts/alert.css      (skin/alert.css)
     skin/classic/messenger/icons/throbber.png       (skin/icons/throbber.png)
-    skin/classic/messenger/icons/throbber.mng       (skin/icons/throbber.mng)
-    skin/classic/messenger/icons/throbber-small.mng (skin/icons/throbber-small.mng)
+    skin/classic/messenger/icons/throbber.gif       (skin/icons/throbber.gif)
+    skin/classic/messenger/icons/throbber-small.gif (skin/icons/throbber-small.gif)
     skin/classic/messenger/icons/throbber-small.png (skin/icons/throbber-small.png)
 
 comm.jar:

mail/base/skin/communicator.css

@@ -64,7 +64,7 @@
 }
 
 #navigator-throbber[busy="true"] {
-  list-style-image: url("chrome://messenger/skin/icons/throbber.mng");
+  list-style-image: url("chrome://messenger/skin/icons/throbber.gif");
 }
 
 toolbar[iconsize="small"] #navigator-throbber,
@@ -73,7 +73,7 @@ toolbar[mode="text"] #navigator-throbber {
 }
 toolbar[iconsize="small"] #navigator-throbber[busy="true"],
 toolbar[mode="text"] #navigator-throbber[busy="true"] {
-  list-style-image: url("chrome://messenger/skin/icons/throbber-small.mng");
+  list-style-image: url("chrome://messenger/skin/icons/throbber-small.gif");
 }
 
 /* ::::: online/offline icons ::::: */

mail/components/compose/skin/messengercompose.css

@@ -95,19 +95,23 @@
 
 #spellingButton {
   list-style-image: url("chrome://editor/skin/icons/btn1.gif");
-  -moz-image-region: rect(101px 23px 122px 0);
+  -moz-image-region: rect(96px 16px 112px 0);
+}
+
+#spellingButton > .toolbarbutton-icon {
+  padding: 3px 0px 2px 4px;
 }
 
 #spellingButton:hover {
-  -moz-image-region: rect(101px 46px 122px 23px);
+  -moz-image-region: rect(96px 32px 112px 16px);
 }
 
 #spellingButton:hover:active {
-  -moz-image-region: rect(122px 23px 143px 0);
+  -moz-image-region: rect(96px 48px 112px 32px);
 }
 
 #spellingButton[disabled="true"] {
-  -moz-image-region: rect(122px 46px 143px 23px) !important;
+  -moz-image-region: rect(96px 64px 112px 48px) !important;
 }
 
 #button-save {

mail/config/basemail-win

@@ -150,7 +150,6 @@ components\xuldoc.xpt
 
 ; Imaging:
 mozz.dll
-components\imgmng.dll
 components\imglib2.dll
 components\imgicon.dll
 components\imgicon.xpt