diff --git a/4chan_x.user.js b/4chan_x.user.js
index 04b2260f4..2ef39f182 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -885,7 +885,6 @@
     },
     keydown: function(e) {
       var o, range, selEnd, selStart, ta, thread, valEnd, valMid, valStart, value, _ref, _ref2;
-      updater.focus = true;
       if (!(key = keybinds.keyCode(e)) || /TEXTAREA|INPUT/.test(e.target.nodeName) && !(e.altKey || e.ctrlKey || e.keyCode === 27)) {
         return;
       }
@@ -2228,18 +2227,6 @@
   updater = {
     init: function() {
       var checkbox, checked, dialog, html, input, name, title, _i, _len, _ref;
-      if (conf['Scrolling']) {
-        if (conf['Scroll BG']) {
-          updater.focus = true;
-        } else {
-          $.on(window, 'focus', (function() {
-            return updater.focus = true;
-          }));
-          $.on(window, 'blur', (function() {
-            return updater.focus = false;
-          }));
-        }
-      }
       html = "<div class=move><span id=count></span> <span id=timer>-" + conf['Interval'] + "</span></div>";
       checkbox = config.updater.checkbox;
       for (name in checkbox) {
@@ -2261,6 +2248,10 @@
           $.on(input, 'click', function() {
             return conf[this.name] = this.checked;
           });
+          if (input.name === 'Scroll BG') {
+            $.on(input, 'click', updater.cb.scrollBG);
+            updater.cb.scrollBG.call(input);
+          }
           if (input.name === 'Verbose') {
             $.on(input, 'click', updater.cb.verbose);
             updater.cb.verbose.call(input);
@@ -2301,6 +2292,13 @@
           return clearTimeout(updater.timeoutID);
         }
       },
+      scrollBG: function() {
+        return updater.scrollBG = this.checked ? function() {
+          return true;
+        } : function() {
+          return !(d.hidden || d.oHidden || d.mozHidden || d.webkitHidden);
+        };
+      },
       update: function() {
         var body, frag, id, newPosts, reply, scroll, _i, _len, _ref, _ref2;
         if (this.status === 404) {
@@ -2350,7 +2348,7 @@
           $.prepend(frag, reply.parentNode.parentNode.parentNode);
         }
         newPosts = frag.childNodes.length;
-        scroll = conf['Scrolling'] && updater.focus && newPosts && (d.body.scrollHeight - d.body.clientHeight - window.scrollY < 20);
+        scroll = conf['Scrolling'] && updater.scrollBG() && newPosts && updater.br.previousElementSibling.getBoundingClientRect().bottom - d.body.clientHeight < 25;
         if (conf['Verbose']) {
           updater.count.textContent = '+' + newPosts;
           if (newPosts === 0) {
@@ -2360,7 +2358,7 @@
           }
         }
         $.before(updater.br, frag);
-        if (scroll) return scrollTo(0, d.body.scrollHeight);
+        if (scroll) return updater.br.previousSibling.scrollIntoView(false);
       }
     },
     timeout: function() {
@@ -3044,7 +3042,6 @@
     },
     scroll: function() {
       var bottom, height, i, reply, _len, _ref;
-      updater.focus = true;
       height = d.body.clientHeight;
       _ref = unread.replies;
       for (i = 0, _len = _ref.length; i < _len; i++) {
diff --git a/script.coffee b/script.coffee
index 0d9d26bd7..f7a588fbd 100644
--- a/script.coffee
+++ b/script.coffee
@@ -643,7 +643,6 @@ keybinds =
     $.on d, 'keydown',  keybinds.keydown
 
   keydown: (e) ->
-    updater.focus = true
     if not (key = keybinds.keyCode(e)) or /TEXTAREA|INPUT/.test(e.target.nodeName) and not (e.altKey or e.ctrlKey or e.keyCode is 27)
       return
 
@@ -1750,12 +1749,6 @@ threadHiding =
 
 updater =
   init: ->
-    if conf['Scrolling']
-      if conf['Scroll BG']
-        updater.focus = true
-      else
-        $.on window, 'focus', (-> updater.focus = true)
-        $.on window, 'blur',  (-> updater.focus = false)
     html = "<div class=move><span id=count></span> <span id=timer>-#{conf['Interval']}</span></div>"
     {checkbox} = config.updater
     for name of checkbox
@@ -1779,6 +1772,9 @@ updater =
       if input.type is 'checkbox'
         $.on input, 'click', $.cb.checked
         $.on input, 'click', -> conf[@name] = @checked
+        if input.name is 'Scroll BG'
+          $.on input, 'click', updater.cb.scrollBG
+          updater.cb.scrollBG.call input
         if input.name is 'Verbose'
           $.on input, 'click', updater.cb.verbose
           updater.cb.verbose.call input
@@ -1811,6 +1807,12 @@ updater =
         updater.timeoutID = setTimeout updater.timeout, 1000
       else
         clearTimeout updater.timeoutID
+    scrollBG: ->
+      updater.scrollBG =
+        if @checked
+          -> true
+        else
+          -> !(d.hidden or d.oHidden or d.mozHidden or d.webkitHidden)
     update: ->
       if @status is 404
         updater.timer.textContent = ''
@@ -1857,7 +1859,8 @@ updater =
         $.prepend frag, reply.parentNode.parentNode.parentNode #table
 
       newPosts = frag.childNodes.length
-      scroll = conf['Scrolling'] && updater.focus && newPosts && (d.body.scrollHeight - d.body.clientHeight - window.scrollY < 20)
+      scroll = conf['Scrolling'] && updater.scrollBG() && newPosts &&
+        updater.br.previousElementSibling.getBoundingClientRect().bottom - d.body.clientHeight < 25
       if conf['Verbose']
         updater.count.textContent = '+' + newPosts
         if newPosts is 0
@@ -1867,7 +1870,7 @@ updater =
 
       $.before updater.br, frag
       if scroll
-        scrollTo 0, d.body.scrollHeight
+        updater.br.previousSibling.scrollIntoView(false)
 
   timeout: ->
     updater.timeoutID = setTimeout updater.timeout, 1000
@@ -2344,7 +2347,6 @@ unread =
       Favicon.update()
 
   scroll: ->
-    updater.focus = true
     height = d.body.clientHeight
     for reply, i in unread.replies
       {bottom} = reply.getBoundingClientRect()