diff --git a/extensions/firefox/components/PdfStreamConverter.js b/extensions/firefox/components/PdfStreamConverter.js
index d371e50cd..7fb42c0cd 100644
--- a/extensions/firefox/components/PdfStreamConverter.js
+++ b/extensions/firefox/components/PdfStreamConverter.js
@@ -219,9 +219,26 @@ ChromeActions.prototype = {
     var strings = getLocalizedStrings('chrome.properties');
     var message = getLocalizedString(strings, 'unsupported_feature');
 
-    var win = Services.wm.getMostRecentWindow('navigator:browser');
-    var browser = win.gBrowser.getBrowserForDocument(domWindow.top.document);
-    var notificationBox = win.gBrowser.getNotificationBox(browser);
+    var notificationBox = null;
+    // Multiple browser windows can be opened, finding one for notification box
+    var windowsEnum = Services.wm
+                      .getZOrderDOMWindowEnumerator('navigator:browser', true);
+    while (windowsEnum.hasMoreElements()) {
+      var win = windowsEnum.getNext();
+      if (win.closed)
+        continue;
+      var browser = win.gBrowser.getBrowserForDocument(domWindow.top.document);
+      if (browser) {
+        // right window/browser is found, getting the notification box
+        notificationBox = win.gBrowser.getNotificationBox(browser);
+        break;
+      }
+    }
+    if (!notificationBox) {
+      log('Unable to get a notification box for the fallback message');
+      return;
+    }
+
     // Flag so we don't call the response callback twice, since if the user
     // clicks open with different viewer both the button callback and
     // eventCallback will be called.
diff --git a/src/canvas.js b/src/canvas.js
index 122dd5e59..9f61ba77b 100644
--- a/src/canvas.js
+++ b/src/canvas.js
@@ -1279,14 +1279,17 @@ function checkPutBinaryImageDataCompatibility() {
   } catch (e) {
     CanvasGraphics.prototype.putBinaryImageData =
       function CanvasGraphicsPutBinaryImageDataShim(ctx, imgData, w, h) {
-        var tmpImgData = ctx.getImageData(0, 0, w, h);
+        var tmpImgData = 'createImageData' in ctx ? ctx.createImageData(w, h) :
+          ctx.getImageData(0, 0, w, h);
 
-        // Copy over the imageData pixel by pixel.
         var tmpImgDataPixels = tmpImgData.data;
-        var len = tmpImgDataPixels.length;
-
-        while (len--) {
-          tmpImgDataPixels[len] = imgData.data[len];
+        var data = imgData.data;
+        if ('set' in tmpImgDataPixels)
+          tmpImgDataPixels.set(data);
+        else {
+          // Copy over the imageData pixel by pixel.
+          for (var i = 0, ii = tmpImgDataPixels.length; i < ii; i++)
+            tmpImgDataPixels[i] = data[i];
         }
 
         ctx.putImageData(tmpImgData, 0, 0);
diff --git a/src/function.js b/src/function.js
index 56b405ede..2088ee219 100644
--- a/src/function.js
+++ b/src/function.js
@@ -103,11 +103,12 @@ var PDFFunction = (function PDFFunctionClosure() {
 
       var size = dict.get('Size');
       var bps = dict.get('BitsPerSample');
-      var order = dict.get('Order');
-      if (!order)
-        order = 1;
-      if (order !== 1)
-        error('No support for cubic spline interpolation: ' + order);
+      var order = dict.get('Order') || 1;
+      if (order !== 1) {
+        // No description how cubic spline interpolation works in PDF32000:2008
+        // As in poppler, ignoring order, linear interpolation may work as good
+        TODO('No support for cubic spline interpolation: ' + order);
+      }
 
       var encode = dict.get('Encode');
       if (!encode) {