--- a/toolkit/content/aboutTelemetry.js
+++ b/toolkit/content/aboutTelemetry.js
@@ -8,16 +8,17 @@ const Ci = Components.interfaces;
 const Cc = Components.classes;
 const Cu = Components.utils;
 
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/TelemetryTimestamps.jsm");
 Cu.import("resource://gre/modules/TelemetryController.jsm");
 Cu.import("resource://gre/modules/TelemetrySession.jsm");
 Cu.import("resource://gre/modules/TelemetryLog.jsm");
+Cu.import("resource://gre/modules/Preferences.jsm");
 
 const Telemetry = Services.telemetry;
 const bundle = Services.strings.createBundle(
   "chrome://global/locale/aboutTelemetry.properties");
 const brandBundle = Services.strings.createBundle(
   "chrome://branding/locale/brand.properties");
 
 // Maximum height of a histogram bar (in em for html, in chars for text)
@@ -37,40 +38,16 @@ const EOL = "\r\n";
 #else
 const EOL = "\n";
 #endif
 
 // Cached value of document's RTL mode
 let documentRTLMode = "";
 
 /**
- * Helper function for fetching a config pref
- *
- * @param aPrefName Name of config pref to fetch.
- * @param aDefault Default value to return if pref isn't set.
- * @return Value of pref
- */
-function getPref(aPrefName, aDefault) {
-  let result = aDefault;
-
-  try {
-    let prefType = Services.prefs.getPrefType(aPrefName);
-    if (prefType == Ci.nsIPrefBranch.PREF_BOOL) {
-      result = Services.prefs.getBoolPref(aPrefName);
-    } else if (prefType == Ci.nsIPrefBranch.PREF_STRING) {
-      result = Services.prefs.getCharPref(aPrefName);
-    }
-  } catch (e) {
-    // Return default if Prefs service throws exception
-  }
-
-  return result;
-}
-
-/**
  * Helper function for determining whether the document direction is RTL.
  * Caches result of check on first invocation.
  */
 function isRTL() {
   if (!documentRTLMode)
     documentRTLMode = window.getComputedStyle(document.body).direction;
   return (documentRTLMode == "rtl");
 }
@@ -93,17 +70,17 @@ let observer = {
   /**
    * Updates the button & text at the top of the page to reflect Telemetry state.
    */
   updatePrefStatus: function updatePrefStatus() {
     // Notify user whether Telemetry is enabled
     let enabledElement = document.getElementById("description-enabled");
     let disabledElement = document.getElementById("description-disabled");
     let toggleElement = document.getElementById("toggle-telemetry");
-    if (getPref(PREF_TELEMETRY_ENABLED, false)) {
+    if (Preferences.get(PREF_TELEMETRY_ENABLED, false)) {
       enabledElement.classList.remove("hidden");
       disabledElement.classList.add("hidden");
       toggleElement.innerHTML = this.disableTelemetry;
     } else {
       enabledElement.classList.add("hidden");
       disabledElement.classList.remove("hidden");
       toggleElement.innerHTML = this.enableTelemetry;
     }
@@ -215,17 +192,17 @@ let SlowSQL = {
   mainThreadTitle: bundle.GetStringFromName("slowSqlMain"),
 
   otherThreadTitle: bundle.GetStringFromName("slowSqlOther"),
 
   /**
    * Render slow SQL statistics
    */
   render: function SlowSQL_render() {
-    let debugSlowSql = getPref(PREF_DEBUG_SLOW_SQL, false);
+    let debugSlowSql = Preferences.get(PREF_DEBUG_SLOW_SQL, false);
     let {mainThread, otherThreads} =
       Telemetry[debugSlowSql ? "debugSlowSQL" : "slowSQL"];
 
     let mainThreadCount = Object.keys(mainThread).length;
     let otherThreadCount = Object.keys(otherThreads).length;
     if (mainThreadCount == 0 && otherThreadCount == 0) {
       return;
     }
@@ -460,17 +437,17 @@ function SymbolicationRequest_handleSymb
   }
 };
 /**
  * Send a request to the symbolication server to symbolicate this stack.
  */
 SymbolicationRequest.prototype.fetchSymbols =
 function SymbolicationRequest_fetchSymbols() {
   let symbolServerURI =
-    getPref(PREF_SYMBOL_SERVER_URI, DEFAULT_SYMBOL_SERVER_URI);
+    Preferences.get(PREF_SYMBOL_SERVER_URI, DEFAULT_SYMBOL_SERVER_URI);
   let request = {"memoryMap" : this.memoryMap, "stacks" : this.stacks,
                  "version" : 3};
   let requestJSON = JSON.stringify(request);
 
   this.symbolRequest = new XMLHttpRequest();
   this.symbolRequest.open("POST", symbolServerURI, true);
   this.symbolRequest.setRequestHeader("Content-type", "application/json");
   this.symbolRequest.setRequestHeader("Content-length",
@@ -956,17 +933,17 @@ function toggleSection(aEvent) {
   statebox.checked = parentElement.classList.contains("expanded");
 }
 
 /**
  * Sets the text of the page header based on a config pref + bundle strings
  */
 function setupPageHeader()
 {
-  let serverOwner = getPref(PREF_TELEMETRY_SERVER_OWNER, "Mozilla");
+  let serverOwner = Preferences.get(PREF_TELEMETRY_SERVER_OWNER, "Mozilla");
   let brandName = brandBundle.GetStringFromName("brandFullName");
   let subtitleText = bundle.formatStringFromName(
     "pageSubtitle", [serverOwner, brandName], 2);
 
   let subtitleElement = document.getElementById("page-subtitle");
   subtitleElement.appendChild(document.createTextNode(subtitleText));
 }
 
@@ -981,18 +958,18 @@ function setupListeners() {
   window.addEventListener("unload",
     function unloadHandler(aEvent) {
       window.removeEventListener("unload", unloadHandler);
       Services.prefs.removeObserver(PREF_TELEMETRY_ENABLED, observer);
   }, false);
 
   document.getElementById("toggle-telemetry").addEventListener("click",
     function () {
-      let value = getPref(PREF_TELEMETRY_ENABLED, false);
-      Services.prefs.setBoolPref(PREF_TELEMETRY_ENABLED, !value);
+      let value = Preferences.get(PREF_TELEMETRY_ENABLED, false);
+      Preferences.set(PREF_TELEMETRY_ENABLED, !value);
   }, false);
 
   document.getElementById("chrome-hangs-fetch-symbols").addEventListener("click",
     function () {
       let hangs = Telemetry.chromeHangs;
       let req = new SymbolicationRequest("chrome-hangs",
                                          ChromeHangs.renderHangHeader,
                                          hangs.memoryMap, hangs.stacks);