diff --git a/layout/tools/reftest/reftest-analyzer.xhtml b/layout/tools/reftest/reftest-analyzer.xhtml
index 4e7c621c939..c59f5b89921 100644
--- a/layout/tools/reftest/reftest-analyzer.xhtml
+++ b/layout/tools/reftest/reftest-analyzer.xhtml
@@ -191,23 +191,28 @@ function fileentry_changed() {
   show_phase("loading");
   var input = ID("fileentry");
   var files = input.files;
-  var log = null;
   if (files.length > 0) {
     // Only handle the first file; don't handle multiple selection.
     // The parts of the log we care about are ASCII-only.  Since we
     // can ignore lines we don't care about, best to read in as
     // iso-8859-1, which guarantees we don't get decoding errors.
-    log = files[0].getAsText("iso-8859-1");
+    var fileReader = new FileReader();
+    fileReader.onload = function(e) {
+      var log = null;
+
+      log = e.target.result;
+      
+      if (log)
+        process_log(log);
+      else
+        show_phase("entry");
+    }
+    fileReader.readAsText(files[0], "iso-8859-1");
   }
   // So the user can process the same filename again (after
   // overwriting the log), clear the value on the form input so we
   // will always get an onchange event.
   input.value = "";
-
-  if (log)
-    process_log(log);
-  else
-    show_phase("entry");
 }
 
 function log_pasted() {
diff --git a/tools/footprint/leak-gauge.html b/tools/footprint/leak-gauge.html
index 34f6afe2105..1a7296daf02 100644
--- a/tools/footprint/leak-gauge.html
+++ b/tools/footprint/leak-gauge.html
@@ -48,7 +48,18 @@ pre.output { border: medium solid; padding: 1em; margin: 1em; }
 </style>
 <script type="text/javascript">
 
-function runfile(file) {
+function runFile(file) {
+  var result = "Results of processing log " + file.fileName + " :\n";
+
+  var fileReader = new FileReader();
+  fileReader.onload = function(e)
+  {
+    runContents(result, e.target.result);
+  }
+  fileReader.readAsText(file, "iso-8859-1");
+}
+
+function runContents(result, contents) {
     // A hash of objects (keyed by the first word of the line in the log)
     // that have two public methods, handle_line and dump (to be called using
     // call, above), along with any private data they need.
@@ -236,9 +247,6 @@ function runfile(file) {
         }
     };
 
-    var result = "Results of processing log " + file.fileName + " :\n";
-
-    var contents = file.getAsText("iso-8859-1");
     var lines = contents.split(/[\r\n]+/);
     for (var j in lines) {
         var line = lines[j];