Make the email address popup act like a context menu isntead of a popup.

themes/modern/messenger/mailWidgets.xml

@@ -8,8 +8,8 @@
   <binding id="mail-emailaddress" extends="resource:/chrome/xulBindings.xml#basetext">
     <content excludes="observes,template">
       	<xul:box inherits="orient" autostretch="never" flex="1">
-          <xul:box orient="vertical" autostretch="never" flex="1">
-            <xul:text class="emailDisplayButton" popup="emailAddressPopup" inherits="value,accesskey,crop"/>
+          <xul:box orient="vertical"  autostretch="never" flex="1">
+            <xul:text class="emailDisplayButton" context="emailAddressPopup" inherits="value,accesskey,crop"/>
           </xul:box>
           <xul:image class="emailDisplayImage" inherits="src"/>
         </xul:box>