diff --git a/extensions/firefox/content/pdfjschildbootstrap.js b/extensions/firefox/content/pdfjschildbootstrap.js
index c9758b3e5..737a49027 100644
--- a/extensions/firefox/content/pdfjschildbootstrap.js
+++ b/extensions/firefox/content/pdfjschildbootstrap.js
@@ -15,7 +15,7 @@
 * limitations under the License.
 */
 /* jshint esnext:true */
-/* globals Components, PdfjsContentUtils, PdfJs */
+/* globals Components, PdfjsContentUtils, PdfJs, Services */
 
 'use strict';
 
@@ -24,11 +24,14 @@
  * initializing our built-in version of pdfjs when running remote.
  */
 
+Components.utils.import('resource://gre/modules/Services.jsm');
 Components.utils.import('resource://pdf.js/PdfJs.jsm');
 Components.utils.import('resource://pdf.js/PdfjsContentUtils.jsm');
 
 // init content utils shim pdfjs will use to access privileged apis.
 PdfjsContentUtils.init();
 
-// register various pdfjs factories that hook us into content loading.
-PdfJs.updateRegistration();
+if (Services.appinfo.processType === Services.appinfo.PROCESS_TYPE_CONTENT) {
+  // register various pdfjs factories that hook us into content loading.
+  PdfJs.updateRegistration();
+}