Bug 616136 - Give popup notification panels role="alert" and make their close buttons tabbable. r=gavin

browser/base/content/browser.xul

@@ -343,7 +343,8 @@
            footertype="promobox"
            position="after_start"
            hidden="true"
-           orient="vertical"/>
+           orient="vertical"
+           role="alert"/>
 
     <!-- Popup for site identity information -->
     <panel id="identity-popup"

browser/base/content/urlbarBindings.xml

@@ -907,7 +907,7 @@
       </xul:vbox>
       <xul:vbox pack="start">
         <xul:toolbarbutton anonid="closebutton"
-                           class="messageCloseButton popup-notification-closebutton"
+                           class="messageCloseButton popup-notification-closebutton tabbable"
                            xbl:inherits="oncommand=closebuttoncommand"
                            tooltiptext="&closeNotification.tooltip;"/>
       </xul:vbox>
@@ -954,7 +954,7 @@
       </xul:vbox>
       <xul:vbox pack="start">
         <xul:toolbarbutton anonid="closebutton"
-                           class="messageCloseButton popup-notification-closebutton"
+                           class="messageCloseButton popup-notification-closebutton tabbable"
                            xbl:inherits="oncommand=closebuttoncommand"
                            tooltiptext="&closeNotification.tooltip;"/>
       </xul:vbox>

toolkit/content/widgets/notification.xml

@@ -444,7 +444,7 @@
       </xul:vbox>
       <xul:vbox pack="start">
         <xul:toolbarbutton anonid="closebutton"
-                           class="messageCloseButton popup-notification-closebutton"
+                           class="messageCloseButton popup-notification-closebutton tabbable"
                            xbl:inherits="oncommand=closebuttoncommand"
                            tooltiptext="&closeNotification.tooltip;"/>
       </xul:vbox>