--- a/toolkit/components/aboutmemory/content/aboutMemory.js
+++ b/toolkit/components/aboutmemory/content/aboutMemory.js
@@ -29,16 +29,17 @@ const KIND_OTHER             = Ci.nsIMem
 
 const UNITS_BYTES            = Ci.nsIMemoryReporter.UNITS_BYTES;
 const UNITS_COUNT            = Ci.nsIMemoryReporter.UNITS_COUNT;
 const UNITS_COUNT_CUMULATIVE = Ci.nsIMemoryReporter.UNITS_COUNT_CUMULATIVE;
 const UNITS_PERCENTAGE       = Ci.nsIMemoryReporter.UNITS_PERCENTAGE;
 
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
 
 XPCOMUtils.defineLazyGetter(this, "nsBinaryStream",
                             () => CC("@mozilla.org/binaryinputstream;1",
                                      "nsIBinaryInputStream",
                                      "setInputStream"));
 XPCOMUtils.defineLazyGetter(this, "nsFile",
                             () => CC("@mozilla.org/file/local;1",
                                      "nsIFile", "initWithPath"));
@@ -665,23 +666,21 @@ function loadMemoryReportsFromFile(aFile
           reader.readAsText(new Blob(this.data));
         } catch (ex) {
           handleException(ex);
         }
       }
     }, null);
 
     let file = new nsFile(aFilename);
-    let fileChan = Services.io.newChannelFromURI2(Services.io.newFileURI(file),
-                                                  null,      // aLoadingNode
-                                                  Services.scriptSecurityManager.getSystemPrincipal(),
-                                                  null,      // aTriggeringPrincipal
-                                                  Ci.nsILoadInfo.SEC_NORMAL,
-                                                  Ci.nsIContentPolicy.TYPE_OTHER);
-    fileChan.asyncOpen(converter, null);
+    let fileChan = NetUtil.newChannel({
+                     uri: Services.io.newFileURI(file),
+                     loadUsingSystemPrincipal: true
+                   });
+    fileChan.asyncOpen2(converter);
 
   } catch (ex) {
     handleException(ex);
   }
 }
 
 /**
  * Like updateAboutMemoryFromReporters(), but gets its data from a file instead