diff --git a/extensions/firefox/content/PdfStreamConverter.jsm b/extensions/firefox/content/PdfStreamConverter.jsm
index a5541c939..b331444ca 100644
--- a/extensions/firefox/content/PdfStreamConverter.jsm
+++ b/extensions/firefox/content/PdfStreamConverter.jsm
@@ -1055,14 +1055,25 @@ PdfStreamConverter.prototype = {
 
     // We can use resource principal when data is fetched by the chrome
     // e.g. useful for NoScript
-    var securityManager = Cc['@mozilla.org/scriptsecuritymanager;1']
-                          .getService(Ci.nsIScriptSecurityManager);
+    var ssm = Cc['@mozilla.org/scriptsecuritymanager;1']
+                .getService(Ci.nsIScriptSecurityManager);
     var uri = NetUtil.newURI(PDF_VIEWER_WEB_PAGE, null, null);
+    var resourcePrincipal;
+//#if MOZCENTRAL
+    resourcePrincipal = ssm.createCodebasePrincipal(uri, {});
+//#else
     // FF16 and below had getCodebasePrincipal, it was replaced by
     // getNoAppCodebasePrincipal (bug 758258).
-    var resourcePrincipal = 'getNoAppCodebasePrincipal' in securityManager ?
-                            securityManager.getNoAppCodebasePrincipal(uri) :
-                            securityManager.getCodebasePrincipal(uri);
+    // FF43 then replaced getNoAppCodebasePrincipal with
+    // createCodebasePrincipal (bug 1165272).
+    if ('createCodebasePrincipal' in ssm) {
+      resourcePrincipal = ssm.createCodebasePrincipal(uri, {});
+    } else if ('getNoAppCodebasePrincipal' in ssm) {
+      resourcePrincipal = ssm.getNoAppCodebasePrincipal(uri);
+    } else {
+      resourcePrincipal = ssm.getCodebasePrincipal(uri);
+    }
+//#endif
     aRequest.owner = resourcePrincipal;
     channel.asyncOpen(proxy, aContext);
   },