Bug 759158 - Introduce accessibility status to about:support. r=gavin

toolkit/content/aboutSupport.js

@@ -95,6 +95,7 @@ window.onload = function () {
   populateExtensionsSection();
   populateGraphicsSection();
   populateJavaScriptSection();
+  populateAccessibilitySection();
   populateLibVersionsSection();
 }
 
@@ -404,6 +405,20 @@ function populateJavaScriptSection() {
   document.getElementById("javascript-incremental-gc").textContent = enabled ? "1" : "0";
 }
 
+function populateAccessibilitySection() {
+  var active;
+  try {
+    active = Components.manager.QueryInterface(Ci.nsIServiceManager)
+      .isServiceInstantiatedByContractID(
+        "@mozilla.org/accessibilityService;1",
+        Ci.nsISupports);
+  } catch (ex) {
+    active = false;
+  }
+
+  document.getElementById("a11y-activated").textContent = active ? "1" : "0";
+}
+
 function getPrefValue(aName) {
   let value = "";
   let type = Services.prefs.getPrefType(aName);

toolkit/content/aboutSupport.xhtml

@@ -239,6 +239,24 @@
 	</tbody>
       </table>
 
+      <!-- - - - - - - - - - - - - - - - - - - - - -->
+      <h2 class="major-section">
+        &aboutSupport.a11yTitle;
+      </h2>
+
+      <table>
+        <tbody>
+          <tr>
+            <th class="column">
+              &aboutSupport.a11yActivated;
+            </th>
+
+            <td id="a11y-activated">
+            </td>
+          </tr>
+	    </tbody>
+      </table>
+
       <!-- - - - - - - - - - - - - - - - - - - - - -->
       <h2 class="major-section">
         &aboutSupport.libraryVersionsTitle;

toolkit/locales/en-US/chrome/global/aboutSupport.dtd

@@ -51,6 +51,9 @@ variant of aboutSupport.showDir.label. -->
 <!ENTITY aboutSupport.jsTitle "JavaScript">
 <!ENTITY aboutSupport.jsIncrementalGC "Incremental GC">
 
+<!ENTITY aboutSupport.a11yTitle "Accessibility">
+<!ENTITY aboutSupport.a11yActivated "Activated">
+
 <!ENTITY aboutSupport.libraryVersionsTitle "Library Versions">
 
 <!ENTITY aboutSupport.installationHistoryTitle "Installation History">