Bug 942051 - should set mode=icons and iconsize=small on the add-on bar for Australis, r=jaws

browser/base/content/browser.xul

@@ -964,7 +964,7 @@
     </toolbar>
 
     <!-- This is a shim which will go away ASAP. See bug 749804 for details -->
-    <toolbar id="addon-bar" toolbar-delegate="nav-bar">
+    <toolbar id="addon-bar" toolbar-delegate="nav-bar" mode="icons" iconsize="small">
       <hbox id="addonbar-closebutton"/>
       <statusbar id="status-bar"/>
     </toolbar>