diff --git a/app/assets/javascripts/discourse/controllers/quote_button_controller.js b/app/assets/javascripts/discourse/controllers/quote_button_controller.js
index 8c1b9110ac8..c6e4ceb7e58 100644
--- a/app/assets/javascripts/discourse/controllers/quote_button_controller.js
+++ b/app/assets/javascripts/discourse/controllers/quote_button_controller.js
@@ -45,9 +45,7 @@ Discourse.QuoteButtonController = Discourse.Controller.extend({
         cloned = range.cloneRange(),
         $ancestor = $(range.commonAncestorContainer);
 
-    // don't display the "quote reply" button if you select text spanning two posts
-    // note: the ".contents" is here to prevent selection of the topic summary
-    if ($ancestor.closest('.topic-body > .contents').length === 0) {
+    if ($ancestor.closest('.cooked').length === 0) {
       this.set('buffer', '');
       return;
     }
diff --git a/app/assets/javascripts/discourse/lib/utilities.js b/app/assets/javascripts/discourse/lib/utilities.js
index e2e3060945b..45a712d1387 100644
--- a/app/assets/javascripts/discourse/lib/utilities.js
+++ b/app/assets/javascripts/discourse/lib/utilities.js
@@ -88,18 +88,18 @@ Discourse.Utilities = {
     var html = '';
 
     if (typeof window.getSelection !== "undefined") {
-        var sel = window.getSelection();
-        if (sel.rangeCount) {
-            var container = document.createElement("div");
-            for (var i = 0, len = sel.rangeCount; i < len; ++i) {
-                container.appendChild(sel.getRangeAt(i).cloneContents());
-            }
-            html = container.innerHTML;
+      var sel = window.getSelection();
+      if (sel.rangeCount) {
+        var container = document.createElement("div");
+        for (var i = 0, len = sel.rangeCount; i < len; ++i) {
+          container.appendChild(sel.getRangeAt(i).cloneContents());
         }
+        html = container.innerHTML;
+      }
     } else if (typeof document.selection !== "undefined") {
-        if (document.selection.type === "Text") {
-            html = document.selection.createRange().htmlText;
-        }
+      if (document.selection.type === "Text") {
+        html = document.selection.createRange().htmlText;
+      }
     }
 
     // Strip out any .click elements from the HTML before converting it to text
diff --git a/app/assets/javascripts/discourse/views/quote_button_view.js b/app/assets/javascripts/discourse/views/quote_button_view.js
index 9c6d02949dc..7741ac08725 100644
--- a/app/assets/javascripts/discourse/views/quote_button_view.js
+++ b/app/assets/javascripts/discourse/views/quote_button_view.js
@@ -64,8 +64,8 @@ Discourse.QuoteButtonView = Discourse.View.extend({
       })
       .on('selectionchange', function() {
         // there is no need to handle this event when the mouse is down
-        // or if there is not a touch in progress
-        if (view.get('isMouseDown') || !view.get('isTouchInProgress')) return;
+        // or if there a touch in progress
+        if (view.get('isMouseDown') || view.get('isTouchInProgress')) return;
         // `selection.anchorNode` is used as a target
         view.selectText(window.getSelection().anchorNode, controller);
       });
diff --git a/app/assets/stylesheets/common/foundation/mixins.scss b/app/assets/stylesheets/common/foundation/mixins.scss
index dbc8b5c076f..830072b3a4b 100644
--- a/app/assets/stylesheets/common/foundation/mixins.scss
+++ b/app/assets/stylesheets/common/foundation/mixins.scss
@@ -55,23 +55,13 @@
 // Border radius
 
 @mixin border-radius-all($radius) {
-          border-radius: $radius;
-}
-
-@mixin border-radius-top($radius) {
-          border-top-right-radius: $radius;
-          border-top-left-radius: $radius;
-}
-
-@mixin border-radius-bottom($radius) {
-          border-bottom-right-radius: $radius;
-          border-bottom-left-radius: $radius;
+  border-radius: $radius;
 }
 
 // Box shadow
 
 @mixin box-shadow($shadow) {
-          box-shadow: $shadow;
+  box-shadow: $shadow;
 }
 
 // Linear gradient
@@ -81,32 +71,6 @@
   background-image: linear-gradient(to bottom, $start-color, $end-color);
 }
 
-// Background size
-
-@mixin background-size($size) {
-          background-size: $size;
-}
-
-// Background clip
-
-@mixin background-clip($clip) {
-          background-clip: $clip;
-}
-
-// Rotate
-
-@mixin rotate($degrees) {
-  -webkit-transform: rotate($degrees);
-          transform: rotate($degrees);
-}
-
-// Scale
-
-@mixin scale($ratio) {
-  -webkit-transform: scale($ratio);
-          transform: scale($ratio);
-}
-
 // Transition
 
 @mixin transition($transition) {
@@ -138,12 +102,6 @@
   }
 }
 
-@mixin fade-soft($time: 1s) {
-  -webkit-transition: opacity $time ease-in-out;
-      -ms-transition: opacity $time ease-in-out;
-          transition: opacity $time ease-in-out;
-}
-
 @mixin visible {
   opacity: 1;
   visibility: visible;
@@ -151,16 +109,6 @@
           transition-delay: 0s;
 }
 
-// Decorations
-// --------------------------------------------------
-
-// Glow
-
-@mixin glow($color) {
-      border: 1px solid $color;
-  box-shadow: 0 0 5px $color;
-}
-
 //
 // --------------------------------------------------
 
diff --git a/app/assets/stylesheets/desktop/compose.scss b/app/assets/stylesheets/desktop/compose.scss
index bbfb05443aa..05592c8ca56 100644
--- a/app/assets/stylesheets/desktop/compose.scss
+++ b/app/assets/stylesheets/desktop/compose.scss
@@ -309,7 +309,7 @@
       border: 1px dashed $gray;
       overflow: auto;
       visibility: visible;
-      
+
       &.hidden {
         width: 0;
         visibility: hidden;
@@ -432,8 +432,7 @@ div.ac-wrap {
     }
 
     #wmd-input, #wmd-preview {
-      box-sizing: border-box;
-      -moz-box-sizing: border-box;
+      @include box-sizing(border-box);
       width: 100%;
       height: 100%;
       min-height: 100%;
@@ -453,7 +452,7 @@ div.ac-wrap {
       top: 0;
       height: 100%;
       min-height: 100%;
-      box-sizing: border-box;
+      @include box-sizing(border-box);
       border: 0;
       border-top: 36px solid transparent;
       @include border-radius-all(0);
@@ -461,8 +460,7 @@ div.ac-wrap {
     }
     .textarea-wrapper, .preview-wrapper {
       position: relative;
-      box-sizing: border-box;
-      -moz-box-sizing: border-box;
+      @include box-sizing(border-box);
       height: 100%;
       min-height: 100%;
       margin: 0;
diff --git a/app/assets/stylesheets/desktop/topic.scss b/app/assets/stylesheets/desktop/topic.scss
index bbec999656b..cdaf714e1a7 100644
--- a/app/assets/stylesheets/desktop/topic.scss
+++ b/app/assets/stylesheets/desktop/topic.scss
@@ -11,13 +11,14 @@
 }
 
 .post-actions {
+  @include unselectable;
   clear: both;
   text-align: right;
-    .post-action {
+  .post-action {
     display: inline-block;
     margin-left: 10px;
     margin-top: 10px;
-    }
+  }
 }
 .post-menu-area {
   margin-bottom: 10px;
diff --git a/app/assets/stylesheets/desktop/user.scss b/app/assets/stylesheets/desktop/user.scss
index 505f543edc6..fef462b893a 100644
--- a/app/assets/stylesheets/desktop/user.scss
+++ b/app/assets/stylesheets/desktop/user.scss
@@ -78,9 +78,7 @@
     .btn {
       width: 100%;
       margin-bottom: 5px;
-      -webkit-box-sizing: border-box;
-         -moz-box-sizing: border-box;
-              box-sizing: border-box;
+      @include box-sizing(border-box);
     }
   }
   h2 {
diff --git a/app/assets/stylesheets/mobile/compose.scss b/app/assets/stylesheets/mobile/compose.scss
index f57a0ac0c3e..b8d2fb34af6 100644
--- a/app/assets/stylesheets/mobile/compose.scss
+++ b/app/assets/stylesheets/mobile/compose.scss
@@ -389,8 +389,7 @@ div.ac-wrap {
     }
 
     #wmd-input, #wmd-preview {
-      box-sizing: border-box;
-      -moz-box-sizing: border-box;
+      @include box-sizing(border-box);
       width: 100%;
       height: 100%;
       min-height: 100%;
@@ -410,7 +409,7 @@ div.ac-wrap {
       top: 0;
       height: 100%;
       min-height: 100%;
-      box-sizing: border-box;
+      @include box-sizing(border-box);
       border: 0;
       border-top: 36px solid transparent;
       @include border-radius-all(0);
@@ -418,8 +417,7 @@ div.ac-wrap {
     }
     .textarea-wrapper, .preview-wrapper {
       position: relative;
-      box-sizing: border-box;
-      -moz-box-sizing: border-box;
+      @include box-sizing(border-box);
       height: 100%;
       min-height: 100%;
       margin: 0;
diff --git a/app/assets/stylesheets/mobile/magnific-popup.scss b/app/assets/stylesheets/mobile/magnific-popup.scss
index 872ae8f2b7b..1c6cdb13a9a 100644
--- a/app/assets/stylesheets/mobile/magnific-popup.scss
+++ b/app/assets/stylesheets/mobile/magnific-popup.scss
@@ -147,9 +147,7 @@ $caption-subtitle-color:          #BDBDBD !default;
   left: 0;
   top: 0;
   padding: 0 $popup-padding-left;
-  -webkit-box-sizing: border-box;
-  -moz-box-sizing: border-box;
-  box-sizing: border-box;
+  @include box-sizing(border-box);
 }
 
 // Vertical centerer helper
@@ -453,9 +451,7 @@ button::-moz-focus-inner {
     height: auto;
     display: block;
     line-height: 0;
-    -webkit-box-sizing: border-box;
-    -moz-box-sizing: border-box;
-    box-sizing: border-box;
+    @include box-sizing(border-box);
     padding: $image-padding-top 0 $image-padding-bottom;
     margin: 0 auto;
   }
@@ -534,9 +530,7 @@ button::-moz-focus-inner {
           top: auto;
           padding: 3px 5px;
           position: fixed;
-          -webkit-box-sizing: border-box;
-          -moz-box-sizing: border-box;
-          box-sizing: border-box;
+          @include box-sizing(border-box);
         }
         .mfp-img-mobile .mfp-bottom-bar:empty {
           padding: 0;
diff --git a/app/assets/stylesheets/mobile/user.scss b/app/assets/stylesheets/mobile/user.scss
index 4ac9aeb6429..bfdd68e2689 100644
--- a/app/assets/stylesheets/mobile/user.scss
+++ b/app/assets/stylesheets/mobile/user.scss
@@ -73,9 +73,7 @@
     .btn {
       width: 100%;
       margin-bottom: 5px;
-      -webkit-box-sizing: border-box;
-         -moz-box-sizing: border-box;
-              box-sizing: border-box;
+      @include box-sizing(border-box);
     }
   }
   h2 {