diff --git a/themes/classic/global/mac/button.css b/themes/classic/global/mac/button.css
index 4ec3e9e30ed..a3ae6176540 100644
--- a/themes/classic/global/mac/button.css
+++ b/themes/classic/global/mac/button.css
@@ -26,7 +26,78 @@
       padding             : 0px;
       color				  : #000000;
     }
+  
+/*** class=plain-extended ***/
+/****************************/
+/* This class has all the functionality of the plain class, but extends it so that it includes
+ * rollover styles, borders, paddings, and margins.  Essentially, this class consists of the
+ * old, pre-Macified button styles, similar to the ones on Windows.  You can use this class if
+ * you want to make standard square buttons that do not look like Mac Buttons with rounded corners, etc.
+ ****************************/
+ 
+  button.plain-extended
+    {
+      behavior            : url("chrome://global/skin/buttonBindings.xml#buttonleft");
+      border-left         : 1px solid #DDDDDD;
+      border-top          : 1px solid #DDDDDD;
+      border-right        : 1px solid #000000;
+      border-bottom       : 1px solid #000000;
+      margin              : 1px 5px 2px 5px;
+      background-color    : #DDDDDD;
+      min-width           : 8em;
+      font                : geneva 10px;
+      color               : #000000;
+      -moz-border-radius  : 3px 2px 2px 3px;
+    }
+  
+  button.plain-extended > .button-box-1  
+    {
+      border-left         : 1px solid #FFFFFF;
+      border-top          : 1px solid #FFFFFF;
+      border-right        : 1px solid #9D9D9D;
+      border-bottom       : 1px solid #9D9D9D;
+    }
+
+  button.plain-extended > .button-box-1 > .button-box-2
+    {
+	  border              : 1px solid #DDDDDD;	
+    }
     
+  button.plain-extended:hover:active 
+    {
+      border              : 1px solid #000000;
+    }
+
+  button.plain-extended:hover:active > .button-box-1
+    {
+      border              : 1px solid #9D9D9D;
+    }
+
+  button.plain-extended:hover:active > .button-box-1 > .button-box-2
+    {
+      border              : 1px solid #DDDDDD;
+    }
+
+  button.plain-extended:hover:active > .button-box-1 > .button-box-2 > .button-box-text
+    {
+      padding             : 1px 2px 0px 3px;
+      color				  : #000000;
+    }
+  
+  button.plain-extended[disabled="true"],
+  button.plain-extended[disabled="true"]:hover:active 
+    {
+      color               : #999999;
+    }
+        
+  button.plain-extended > .button-box-1 > .button-box-2 > .button-box-text,
+  button.plain-extended > .button-box-1 > .button-box-2 > .button-box-text
+    {
+      padding             : 0px 3px 1px 2px;
+    }
+
+  
+  
 /** Mac Buttons **/
 /** All .button-* styles also apply to dialog exit buttons (OK/Cancel) (as seen in XBL binding) **/
 
diff --git a/themes/classic/global/unix/button.css b/themes/classic/global/unix/button.css
index b8ad1795a65..960661261c2 100644
--- a/themes/classic/global/unix/button.css
+++ b/themes/classic/global/unix/button.css
@@ -124,5 +124,17 @@
       margin              : 0px;
       padding             : 0px;
     }
+
+/*** class = "plain-extended" ***/
+/********************************/
+/* This is a dummy class that is specified in the several XUL files for the sake of the
+ * Macintosh Classic Skin.  This class has essentially the same behavior and styles as
+ * the above <button> and accompanying styles, but is useful in the Mac Classic skin.  This is because <button>
+ * styles have been completely rewritten to produce Macintosh buttons with bevels, rounded corners,
+ * etc.  Plain-extended thereby functions to produce square buttons with all the same hover and active
+ * effects that modern <button>'s do.
+ ********************************/
+
+button.plain-extended {}
     
-    
+
diff --git a/themes/classic/global/win/button.css b/themes/classic/global/win/button.css
index 7f0b7cebece..728e69379cd 100644
--- a/themes/classic/global/win/button.css
+++ b/themes/classic/global/win/button.css
@@ -124,7 +124,20 @@
       margin              : 0px;
       padding             : 0px;
     }
-    
+
+/*** class = "plain-extended" ***/
+/********************************/
+/* This is a dummy class that is specified in several XUL files for the sake of the
+ * Macintosh Classic Skin.  This class has essentially the same behavior and styles as
+ * the above <button> and accompanying styles, but is useful in the Mac Classic skin.  This is because <button>
+ * styles have been completely rewritten to produce Macintosh buttons with bevels, rounded corners,
+ * etc.  Plain-extended thereby functions to produce square buttons with all the same hover and active
+ * effects that modern <button>'s do.
+ ********************************/
+
+button.plain-extended {}
+
+   
   .reorder-up
     {
       min-width           : 0px;
@@ -144,4 +157,4 @@
       padding             : none;
     }
     
-    
\ No newline at end of file
+    
diff --git a/themes/modern/global/button.css b/themes/modern/global/button.css
index 460ae056969..177ccad9eeb 100644
--- a/themes/modern/global/button.css
+++ b/themes/modern/global/button.css
@@ -148,6 +148,18 @@
       padding             : 0px;
     }
     
+/*** class = "plain-extended" ***/
+/********************************/
+/* This is a dummy class that is specified in the several XUL files for the sake of the
+ * Macintosh Classic Skin.  This class has essentially the same behavior and styles as
+ * the above <button> and accompanying styles, but is useful in the Mac Classic skin.  This is because <button>
+ * styles have been completely rewritten to produce Macintosh buttons with bevels, rounded corners,
+ * etc.  Plain-extended thereby functions to produce square buttons with all the same hover and active
+ * effects that modern <button>'s do.
+ ********************************/
+
+button.plain-extended {}
+
 
 /** 
  * utility class for buttons with associated popup
@@ -158,4 +170,4 @@
   }
     
     
-    
\ No newline at end of file
+