diff --git a/background.html b/background.html
index 889ef41c..27062aec 100644
--- a/background.html
+++ b/background.html
@@ -106,6 +106,15 @@
       </div>
     </div>
   </script>
+  <script type='text/x-tmpl-mustache' id='lightbox'>
+    <div class='content'>
+      <div class='controls'>
+        <a class='x close' alt='Close image.' href='#'></a>
+        <a class='save' alt='Save as...' href='#'></a>
+      </div>
+      <img class='image' src='{{ url }}' />
+    </div>
+  </script>
   <script type='text/x-tmpl-mustache' id='confirmation-dialog'>
     <div class="content">
       <div class='message'>{{ message }}</div>
diff --git a/images/save.svg b/images/save.svg
new file mode 100644
index 00000000..be715fcc
--- /dev/null
+++ b/images/save.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" viewBox="0 0 48 48"><path d="M34 6H10c-2.21 0-4 1.79-4 4v28c0 2.21 1.79 4 4 4h28c2.21 0 4-1.79 4-4V14l-8-8zM24 38c-3.31 0-6-2.69-6-6s2.69-6 6-6 6 2.69 6 6-2.69 6-6 6zm6-20H10v-8h20v8z"/></svg>
\ No newline at end of file
diff --git a/js/views/attachment_view.js b/js/views/attachment_view.js
index 39ae0a98..ee9e51ba 100644
--- a/js/views/attachment_view.js
+++ b/js/views/attachment_view.js
@@ -31,14 +31,10 @@
       },
       events: {
           'load': 'update',
-          'click': 'open'
       },
       update: function() {
         this.trigger('update');
       },
-      open: function () {
-        window.open(this.dataUrl, '_blank');
-      },
       render: function() {
         this.$el.attr('src', this.dataUrl);
         return this;
@@ -72,16 +68,42 @@
   Whisper.AttachmentView = Backbone.View.extend({
     tagName: 'span',
     className: 'attachment',
+    initialize: function() {
+        this.blob = new Blob([this.model.data], {type: this.model.contentType});
+
+        var parts = this.model.contentType.split('/');
+        this.contentType = parts[0];
+        this.fileType = parts[1];
+    },
+    events: {
+        'click': 'onclick'
+    },
+    onclick: function(e) {
+        if (this.contentType === 'image') {
+            var view = new Whisper.LightboxView({
+                model: {
+                    url      : this.objectUrl,
+                    blob     : this.blob,
+                    fileType : this.fileType
+                }
+            });
+            view.render();
+            view.$el.appendTo(this.el);
+            view.$el.trigger('show');
+        }
+    },
     render: function() {
         var View;
-        switch(this.model.contentType.split('/')[0]) {
+        switch(this.contentType) {
             case 'image': View = ImageView; break;
             case 'audio': View = AudioView; break;
             case 'video': View = VideoView; break;
             default     : View = FileView; break;
         }
-        var blob = new Blob([this.model.data], {type: this.model.contentType});
-        var view = new View(window.URL.createObjectURL(blob), this.model.contentType);
+        if (!this.objectUrl) {
+            this.objectUrl = window.URL.createObjectURL(this.blob);
+        }
+        var view = new View(this.objectUrl, this.model.contentType);
         view.$el.appendTo(this.$el);
         view.on('update', this.trigger.bind(this, 'update'));
         view.render();
@@ -89,4 +111,46 @@
     }
   });
 
+  Whisper.LightboxView = Whisper.View.extend({
+      templateName: 'lightbox',
+      className: 'modal lightbox',
+      events: {
+          'click .save': 'save',
+          'click .close': 'remove',
+          'click': 'onclick'
+      },
+      save: function(e) {
+            var suggestedName;
+            if (this.model.fileType) {
+                suggestedName = 'signal.' + this.model.fileType;
+            }
+            var w = extension.windows.getViews()[0];
+            if (w && w.chrome && w.chrome.fileSystem) {
+                w.chrome.fileSystem.chooseEntry({
+                    type: 'saveFile', suggestedName: suggestedName
+                }, function(entry) {
+                    if (!entry) {
+                        return;
+                    }
+                    entry.createWriter(function(fileWriter) {
+                        fileWriter.write(this.model.blob);
+                    }.bind(this));
+                }.bind(this));
+            } else {
+                console.log('Failed to get window');
+            }
+      },
+      onclick: function(e) {
+          var $el = this.$(e.target);
+          if (!$el.hasClass('image') && !$el.closest('.controls').length ) {
+              e.preventDefault();
+              this.remove();
+              return false;
+          }
+      },
+      render_attributes: function() {
+          return { url: this.model.url };
+      }
+  });
+
 })();
diff --git a/js/views/inbox_view.js b/js/views/inbox_view.js
index bc5595e6..5dc6f9cc 100644
--- a/js/views/inbox_view.js
+++ b/js/views/inbox_view.js
@@ -118,7 +118,8 @@
             'click .settings': 'showSettings',
             'select .gutter .conversation-list-item': 'openConversation',
             'input input.search': 'filterContacts',
-            'click .restart-signal': 'reloadBackgroundPage'
+            'click .restart-signal': 'reloadBackgroundPage',
+            'show .lightbox': 'showLightbox'
         },
         focusConversation: function(e) {
             if (e && this.$(e.target).closest('.placeholder').length) {
@@ -163,6 +164,9 @@
             this.$('.debug-log').remove();
             new Whisper.DebugLogView().$el.appendTo(this.el);
         },
+        showLightbox: function(e) {
+            this.$el.append(e.target);
+        },
         closeMenu: function(e) {
             if (e && this.$(e.target).parent('.global-menu').length > 0 ) {
                 return;
diff --git a/manifest.json b/manifest.json
index 7c22c187..2f6edc27 100644
--- a/manifest.json
+++ b/manifest.json
@@ -12,7 +12,7 @@
     "permissions": [
       "unlimitedStorage",
       "notifications",
-      "fileSystem",
+      {"fileSystem": ["write"]},
       "alarms",
       "fullscreen"
     ],
diff --git a/stylesheets/_lightbox.scss b/stylesheets/_lightbox.scss
new file mode 120000
index 00000000..c03196d2
--- /dev/null
+++ b/stylesheets/_lightbox.scss
@@ -0,0 +1 @@
+../components/lightbox2/dist/css/lightbox.css
\ No newline at end of file
diff --git a/stylesheets/manifest.css b/stylesheets/manifest.css
index 5342a623..e98854f1 100644
--- a/stylesheets/manifest.css
+++ b/stylesheets/manifest.css
@@ -496,6 +496,48 @@ input[type=text]:active, input[type=text]:focus, input[type=search]:active, inpu
     border: solid 1px #ccc;
     border-right: none; }
 
+.lightbox.modal {
+  padding: 30px;
+  text-align: center;
+  background-color: rgba(0, 0, 0, 0.8); }
+  .lightbox.modal .content {
+    margin: 0;
+    padding: 0 50px;
+    max-width: 100%;
+    height: 100%;
+    box-shadow: none;
+    background: transparent; }
+    .lightbox.modal .content img {
+      display: block;
+      margin: auto;
+      max-width: 100%;
+      max-height: 100%; }
+  .lightbox.modal .controls {
+    position: absolute;
+    top: 0;
+    right: 0;
+    width: 50px; }
+  .lightbox.modal a {
+    background: transparent;
+    width: 50px;
+    height: 50px;
+    margin-bottom: 10px;
+    display: inline-block;
+    cursor: pointer;
+    border-radius: 50%;
+    padding: 3px; }
+    .lightbox.modal a:before {
+      content: '';
+      display: block;
+      width: 100%;
+      height: 100%; }
+    .lightbox.modal a:hover {
+      background: #616161; }
+  .lightbox.modal .save:before {
+    -webkit-mask: url("/images/save.svg") no-repeat center;
+    -webkit-mask-size: 100%;
+    background-color: white; }
+
 .conversation-stack,
 .new-conversation, .inbox, .gutter {
   height: 100%; }
diff --git a/stylesheets/manifest.scss b/stylesheets/manifest.scss
index 44114e4a..6ba6feaa 100644
--- a/stylesheets/manifest.scss
+++ b/stylesheets/manifest.scss
@@ -6,6 +6,7 @@
 // Components
   @import 'progress';
   @import 'debugLog';
+  @import 'lightbox';
 
 // Build the main view
   @import 'index';