diff --git a/browser/metro/base/content/browser-scripts.js b/browser/metro/base/content/browser-scripts.js
index 5d426ec04052..179015bdcb9f 100644
--- a/browser/metro/base/content/browser-scripts.js
+++ b/browser/metro/base/content/browser-scripts.js
@@ -28,9 +28,6 @@ XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
 XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
                                   "resource://gre/modules/NetUtil.jsm");
 
-XPCOMUtils.defineLazyModuleGetter(this, "PdfJs",
-                                  "resource://pdf.js/PdfJs.jsm");
-
 XPCOMUtils.defineLazyModuleGetter(this, "DownloadUtils",
                                   "resource://gre/modules/DownloadUtils.jsm");
 
diff --git a/browser/metro/base/content/browser-ui.js b/browser/metro/base/content/browser-ui.js
index a224e0596dce..186c482725e3 100644
--- a/browser/metro/base/content/browser-ui.js
+++ b/browser/metro/base/content/browser-ui.js
@@ -148,7 +148,6 @@ var BrowserUI = {
         DialogUI.init();
         FormHelperUI.init();
         FindHelperUI.init();
-        PdfJs.init();
       } catch(ex) {
         Util.dumpLn("Exception in delay load module:", ex.message);
       }
diff --git a/browser/metro/profile/metro.js b/browser/metro/profile/metro.js
index 754a2b130a51..d5c6a7002155 100644
--- a/browser/metro/profile/metro.js
+++ b/browser/metro/profile/metro.js
@@ -564,10 +564,10 @@ pref("browser.chrome.toolbar_tips", false);
 // Completely disable pdf.js as an option to preview pdfs within firefox.
 // Note: if this is not disabled it does not necessarily mean pdf.js is the pdf
 // handler just that it is an option.
-pref("pdfjs.disabled", false);
+pref("pdfjs.disabled", true);
 // Used by pdf.js to know the first time firefox is run with it installed so it
 // can become the default pdf viewer.
-pref("pdfjs.firstRun", true);
+pref("pdfjs.firstRun", false);
 // The values of preferredAction and alwaysAskBeforeHandling before pdf.js
 // became the default.
 pref("pdfjs.previousHandler.preferredAction", 0);