Bug 1572641 Part 1: Make all of the privacy panel sub panels browseable documents for screen readers, r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D41349

--HG--
extra : moz-landing-system : lando

browser/components/controlcenter/content/protectionsPanel.inc.xul

@@ -15,6 +15,7 @@
   <panelmultiview id="protections-popup-multiView"
                   mainViewId="protections-popup-mainView">
     <panelview id="protections-popup-mainView"
+               role="document"
                descriptionheightworkaround="true">
       <hbox id="protections-popup-mainView-panel-header"
             flex="1"
@@ -133,6 +134,7 @@
 
     <!-- Site Not Working? SubView -->
     <panelview id="protections-popup-siteNotWorkingView"
+               role="document"
                title="&protections.siteNotWorkingView.title;"
                descriptionheightworkaround="true"
                flex="1">