diff --git a/extensions/chromium/extension-router.js b/extensions/chromium/extension-router.js
index d9a0c23e1..e4ff6f426 100644
--- a/extensions/chromium/extension-router.js
+++ b/extensions/chromium/extension-router.js
@@ -27,6 +27,8 @@ limitations under the License.
     'ftp',
     'file',
     'chrome-extension',
+    'blob',
+    'data',
     // Chromium OS
     'filesystem',
     // Chromium OS, shorthand for filesystem:<origin>/external/
diff --git a/extensions/chromium/manifest.json b/extensions/chromium/manifest.json
index 230bb762a..78eff2515 100644
--- a/extensions/chromium/manifest.json
+++ b/extensions/chromium/manifest.json
@@ -63,6 +63,8 @@
     "ftp:/*",
     "file:/*",
     "chrome-extension:/*",
+    "blob:*",
+    "data:*",
     "filesystem:/*",
     "drive:*"
   ]
diff --git a/web/app.js b/web/app.js
index 5c236c355..3922750f3 100644
--- a/web/app.js
+++ b/web/app.js
@@ -574,14 +574,17 @@ var PDFViewerApplication = {
   setTitleUsingUrl: function pdfViewSetTitleUsingUrl(url) {
     this.url = url;
     this.baseUrl = url.split('#')[0];
-    try {
-      this.setTitle(decodeURIComponent(
-        pdfjsLib.getFilenameFromUrl(url)) || url);
-    } catch (e) {
-      // decodeURIComponent may throw URIError,
-      // fall back to using the unprocessed url in that case
-      this.setTitle(url);
+    var title = getPDFFileNameFromURL(url, '');
+    if (!title) {
+      try {
+        title = decodeURIComponent(pdfjsLib.getFilenameFromUrl(url)) || url;
+      } catch (e) {
+        // decodeURIComponent may throw URIError,
+        // fall back to using the unprocessed url in that case
+        title = url;
+      }
     }
+    this.setTitle(title);
   },
 
   setTitle: function pdfViewSetTitle(title) {
@@ -742,7 +745,9 @@ var PDFViewerApplication = {
     }
 
     var url = this.baseUrl;
-    var filename = getPDFFileNameFromURL(url);
+    // Use this.url instead of this.baseUrl to perform filename detection based
+    // on the reference fragment as ultimate fallback if needed.
+    var filename = getPDFFileNameFromURL(this.url);
     var downloadManager = this.downloadManager;
     downloadManager.onerror = function (err) {
       // This error won't really be helpful because it's likely the
diff --git a/web/pdf_attachment_viewer.js b/web/pdf_attachment_viewer.js
index dbfda4b3d..4b3e16f28 100644
--- a/web/pdf_attachment_viewer.js
+++ b/web/pdf_attachment_viewer.js
@@ -86,6 +86,38 @@ var PDFAttachmentViewer = (function PDFAttachmentViewerClosure() {
       this._renderedCapability.resolve();
     },
 
+    /**
+     * @private
+     */
+    _bindPdfLink:
+        function PDFAttachmentViewer_bindPdfLink(button, content, filename) {
+      var blobUrl;
+      button.onclick = function() {
+        if (!blobUrl) {
+          blobUrl = pdfjsLib.createObjectURL(
+            content, 'application/pdf', pdfjsLib.PDFJS.disableCreateObjectURL);
+        }
+        var viewerUrl;
+        if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
+          // The current URL is the viewer, let's use it and append the file.
+          viewerUrl = '?file=' + encodeURIComponent(blobUrl + '#' + filename);
+        } else if (PDFJSDev.test('CHROME')) {
+          // In the Chrome extension, the URL is rewritten using the history API
+          // in viewer.js, so an absolute URL must be generated.
+          // eslint-disable-next-line no-undef
+          viewerUrl = chrome.runtime.getURL('/content/web/viewer.html') +
+            '?file=' + encodeURIComponent(blobUrl + '#' + filename);
+        } else {
+          // Let Firefox's content handler catch the URL and display the PDF.
+          // In Firefox PDFJS.disableCreateObjectURL is always false, so
+          // blobUrl is always a blob:-URL and never a data:-URL.
+          viewerUrl = blobUrl + '?' + encodeURIComponent(filename);
+        }
+        window.open(viewerUrl);
+        return false;
+      };
+    },
+
     /**
      * @private
      */
@@ -124,11 +156,18 @@ var PDFAttachmentViewer = (function PDFAttachmentViewerClosure() {
       for (var i = 0; i < attachmentsCount; i++) {
         var item = attachments[names[i]];
         var filename = pdfjsLib.getFilenameFromUrl(item.filename);
+        filename = pdfjsLib.removeNullCharacters(filename);
+
         var div = document.createElement('div');
         div.className = 'attachmentsItem';
         var button = document.createElement('button');
-        this._bindLink(button, item.content, filename);
-        button.textContent = pdfjsLib.removeNullCharacters(filename);
+        button.textContent = filename;
+        if (/\.pdf$/i.test(filename)) {
+          this._bindPdfLink(button, item.content, filename);
+        } else {
+          this._bindLink(button, item.content, filename);
+        }
+
         div.appendChild(button);
         this.container.appendChild(div);
       }
diff --git a/web/ui_utils.js b/web/ui_utils.js
index fd925d1ba..54b4d9226 100644
--- a/web/ui_utils.js
+++ b/web/ui_utils.js
@@ -368,11 +368,15 @@ function noContextMenuHandler(e) {
 /**
  * Returns the filename or guessed filename from the url (see issue 3455).
  * url {String} The original PDF location.
+ * defaultFilename {string} The value to return if the file name is unknown.
  * @return {String} Guessed PDF file name.
  */
-function getPDFFileNameFromURL(url) {
-  var reURI = /^(?:([^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/;
-  //            SCHEME      HOST         1.PATH  2.QUERY   3.REF
+function getPDFFileNameFromURL(url, defaultFilename) {
+  if (typeof defaultFilename === 'undefined') {
+    defaultFilename = 'document.pdf';
+  }
+  var reURI = /^(?:(?:[^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/;
+  //            SCHEME        HOST         1.PATH  2.QUERY   3.REF
   // Pattern to get last matching NAME.pdf
   var reFilename = /[^\/?#=]+\.pdf\b(?!.*\.pdf\b)/i;
   var splitURI = reURI.exec(url);
@@ -392,7 +396,7 @@ function getPDFFileNameFromURL(url) {
       }
     }
   }
-  return suggestedFilename || 'document.pdf';
+  return suggestedFilename || defaultFilename;
 }
 
 function normalizeWheelEventDelta(evt) {