diff --git a/customize.dist/src/less2/include/buttons.less b/customize.dist/src/less2/include/buttons.less
index ad6aaf9cc..a907d2a0b 100644
--- a/customize.dist/src/less2/include/buttons.less
+++ b/customize.dist/src/less2/include/buttons.less
@@ -85,6 +85,7 @@
             white-space: normal;
             font-weight: bold;
         }
+
         &.danger, &.btn-danger {
             background-color: @colortheme_alertify-red;
             border-color: @colortheme_alertify-red-border;
@@ -94,6 +95,14 @@
             }
         }
 
+        &.danger-alt, &.btn-danger-alt {
+            border-color: @colortheme_alertify-red;
+            color: @colortheme_alertify-red;
+            &:hover, &:active {
+                background-color: lighten(@colortheme_alertify-red, 35%);
+            }
+        }
+
         &.safe, &.btn-safe {
             background-color: @colortheme_alertify-green;
             border-color: @colortheme_alertify-green-border;
diff --git a/www/common/common-ui-elements.js b/www/common/common-ui-elements.js
index b5e5aa90a..af1b4f679 100644
--- a/www/common/common-ui-elements.js
+++ b/www/common/common-ui-elements.js
@@ -30,6 +30,13 @@ define([
         });
     }
 
+    UIElements.prettySize = function (bytes) {
+        var kB = Util.bytesToKilobytes(bytes);
+        if (kB < 1024) { return kB + Messages.KB; }
+        var mB = Util.bytesToMegabytes(bytes);
+        return mB + Messages.MB;
+    };
+
     UIElements.updateTags = function (common, href) {
         var existing, tags;
         NThen(function(waitFor) {
diff --git a/www/common/common-util.js b/www/common/common-util.js
index da83b5960..e3ca9d007 100644
--- a/www/common/common-util.js
+++ b/www/common/common-util.js
@@ -224,6 +224,7 @@
         else if (bytes >= oneMegabyte) { return 'MB'; }
     };
 
+
     // given a path, asynchronously return an arraybuffer
     Util.fetch = function (src, cb, progress) {
         var CB = Util.once(cb);
diff --git a/www/common/sframe-common-file.js b/www/common/sframe-common-file.js
index c7ca340a6..c1d0b74c0 100644
--- a/www/common/sframe-common-file.js
+++ b/www/common/sframe-common-file.js
@@ -182,13 +182,6 @@ define([
             }
         };
 
-        var prettySize = function (bytes) {
-            var kB = Util.bytesToKilobytes(bytes);
-            if (kB < 1024) { return kB + Messages.KB; }
-            var mB = Util.bytesToMegabytes(bytes);
-            return mB + Messages.MB;
-        };
-
         queue.next = function () {
             if (queue.queue.length === 0) {
                 clearTimeout(queue.to);
@@ -251,7 +244,7 @@ define([
             // name
             $('<td>').append($link).appendTo($tr);
             // size
-            $('<td>').text(prettySize(estimate)).appendTo($tr);
+            $('<td>').text(UIElements.prettySize(estimate)).appendTo($tr);
             // progress
             $('<td>', {'class': 'cp-fileupload-table-progress'}).append($progressContainer).appendTo($tr);
             // cancel
diff --git a/www/settings/inner.js b/www/settings/inner.js
index 385c35cb4..31b62220c 100644
--- a/www/settings/inner.js
+++ b/www/settings/inner.js
@@ -73,6 +73,7 @@ define([
             'cp-settings-thumbnails',
             'cp-settings-drive-backup',
             'cp-settings-drive-import-local',
+            'cp-settings-trim-history'
             //'cp-settings-drive-reset'
         ],
         'cursor': [
@@ -1197,6 +1198,40 @@ define([
         return $div;
     };
 
+    makeBlock('trim-history', function (cb) {
+        // XXX settings_trimHistoryTitle, settings_trimHistoryHint, settings_trimHistoryButton
+        // XXX trimHistory_confirm
+
+        var spinner = UI.makeSpinner();
+        var button = h('button.btn.btn-danger-alt', {
+            disabled: 'disabled'
+        }, Messages.trimHistoryButton || 'test'); // XXX
+        var currentSize = h('p', $(spinner.spinner).clone()[0]);
+        var content = h('div', [
+            currentSize,
+            button,
+            spinner.ok,
+            spinner.spinner
+        ]);
+
+        Messages.trimHistory_currentSize = 'Abcd: <b>{0}</b>'; // XXX
+
+        var size;
+        nThen(function (waitFor) {
+            size = UIElements.prettySize(1024*12); // XXX get size
+        }).nThen(function () {
+            $(currentSize).html(Messages._getKey('trimHistory_currentSize', [size]));
+            $(button).click(function () {
+                UI.confirm(Messages.trimHistory_confirm, function (yes) {
+                    if (!yes) { return; }
+                    spinner.spin();
+                });
+            }).prop('disabled', '');
+        });
+
+        cb(content);
+    }, true);
+
     /*
     create['drive-reset'] = function () {
         var $div = $('<div>', {'class': 'cp-settings-drive-reset cp-sidebarlayout-element'});