Bug 278859: fix minor layout-debug issues when using Firefox, r=dbaron

extensions/layout-debug/ui/content/contents.rdf

@@ -58,9 +58,13 @@
   <!-- overlay information -->
   <RDF:Seq about="urn:mozilla:overlays">
     <RDF:li resource="chrome://communicator/content/tasksOverlay.xul"/>
+    <RDF:li resource="chrome://browser/content/browser.xul"/>
   </RDF:Seq>
 
   <RDF:Seq about="chrome://communicator/content/tasksOverlay.xul">
     <RDF:li>chrome://layoutdebug/content/layoutdebug-overlay.xul</RDF:li>
   </RDF:Seq>
+  <RDF:Seq about="chrome://browser/content/browser.xul">
+    <RDF:li>chrome://layoutdebug/content/layoutdebug-overlay.xul</RDF:li>
+  </RDF:Seq>
 </RDF:RDF>

extensions/layout-debug/ui/content/layoutdebug-overlay.xul

@@ -52,9 +52,7 @@
 <overlay id="layoutdebugTaskMenuID"
          xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
-<!--
-  This is the id that the menuitem will be appended to.  see tasksOverlay.xul
--->
+<!-- SeaMonkey -->
 <menupopup id="taskPopup">
   <menuitem label="&ldbCmd.label;"
             accesskey="&ldbCmd.accesskey;"
@@ -62,4 +60,13 @@
                                           'chrome://layoutdebug/content/');"/>
 </menupopup>
 
+<!-- Firefox -->
+<menupopup id="menu_ToolsPopup">
+  <menuitem label="&ldbCmd.label;"
+            accesskey="&ldbCmd.accesskey;"
+            insertafter="javascriptConsole"
+            oncommand="toOpenWindowByType('mozapp:layoutdebug',
+                                          'chrome://layoutdebug/content/');"/>
+</menupopup>
+
 </overlay>

extensions/layout-debug/ui/content/layoutdebug.xul

@@ -53,7 +53,6 @@
 <?xml-stylesheet href="chrome://communicator/skin/" type="text/css" ?>
 
 <?xul-overlay href="chrome://global/content/globalOverlay.xul"?>
-<?xul-overlay href="chrome://communicator/content/utilityOverlay.xul"?>
 <?xul-overlay href="chrome://communicator/content/tasksOverlay.xul"?>
 
 <!--
@@ -103,15 +102,6 @@
             <menuitem id="menu_close" label="Close" accesskey="C" oncommand="window.close();"/>
           </menupopup>
         </menu>
-        <menu id="menu_edit">
-          <menupopup>
-            <menuitem id="menu_cut" />
-            <menuitem id="menu_copy" />
-            <menuitem id="menu_paste" />
-            <menuitem id="menu_delete" />
-            <menuitem id="menu_selectAll" />
-          </menupopup>
-        </menu>
         <menu label="&ldb.RegressionTestMenu.label;"
               accesskey="&ldb.RegressionTestMenu.accesskey;">
           <menupopup>