diff --git a/builds/appchan-x.js b/builds/appchan-x.js
index bcd3bf5c4..e6fc2e492 100644
--- a/builds/appchan-x.js
+++ b/builds/appchan-x.js
@@ -42,7 +42,7 @@
  */
 
 (function() {
-  var $, $$, Anonymize, ArchiveLink, Banner, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, GlobalMessage, Header, Icons, ImageExpand, ImageHover, ImageReplace, JSColor, Keybinds, Linkify, Main, MascotTools, Mascots, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, Report, ReportLink, RevealSpoilers, Rice, Sauce, Settings, Style, ThemeTools, Themes, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, editMascot, editTheme, g, userNavigation,
+  var $, $$, Anonymize, ArchiveLink, Banner, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, GlobalMessage, Header, Icons, ImageExpand, ImageHover, ImageReplace, JSColor, Keybinds, Linkify, Main, MascotTools, Mascots, Menu, MutationObserver, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, Report, ReportLink, RevealSpoilers, Rice, Sauce, Settings, Style, ThemeTools, Themes, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, editMascot, editTheme, g, userNavigation,
     __slice = [].slice,
     __hasProp = {}.hasOwnProperty,
     __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };
@@ -332,6 +332,8 @@
     posts: {}
   };
 
+  MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.OMutationObserver;
+
   Mascots = {
     'Akiyama_Mio': {
       category: 'Anime',
@@ -9617,7 +9619,7 @@
         }), this.ready.bind(this));
       },
       ready: function() {
-        var MutationObserver, imgContainer, input, observer, setLifetime,
+        var imgContainer, input, observer, setLifetime,
           _this = this;
 
         setLifetime = function(e) {
@@ -9643,7 +9645,7 @@
           img: imgContainer.firstChild,
           input: input
         };
-        if (MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.OMutationObserver) {
+        if (MutationObserver) {
           observer = new MutationObserver(this.load.bind(this));
           observer.observe(this.nodes.challenge, {
             childList: true
@@ -10524,15 +10526,22 @@
       return this.cb = QuoteThreading.nodeinsert;
     },
     nodeinsert: function() {
-      var posts, qpost, qroot, threadContainer;
+      var bottom, height, posts, qpost, qroot, threadContainer, top, _ref;
 
       posts = g.posts;
       qpost = posts[this.threaded];
       delete this.threaded;
       delete this.cb;
-      if (this.thread.OP === qpost || (QuoteThreading.hasRun && !Unread.posts.contains(qpost))) {
+      if (this.thread.OP === qpost) {
         return false;
       }
+      if (QuoteThreading.hasRun) {
+        height = doc.clientHeight;
+        _ref = qpost.nodes.root.getBoundingClientRect(), bottom = _ref.bottom, top = _ref.top;
+        if (!(Unread.posts.contains(qpost) || ((bottom < height) && (top > 0)))) {
+          return false;
+        }
+      }
       qroot = qpost.nodes.root;
       threadContainer = qroot.nextSibling;
       if ((threadContainer != null ? threadContainer.className : void 0) !== 'threadContainer') {
diff --git a/builds/appchan-x.user.js b/builds/appchan-x.user.js
index f181dcc85..9fdc32f3a 100644
--- a/builds/appchan-x.user.js
+++ b/builds/appchan-x.user.js
@@ -42,7 +42,7 @@
  */
 
 (function() {
-  var $, $$, Anonymize, ArchiveLink, Banner, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, GlobalMessage, Header, Icons, ImageExpand, ImageHover, ImageReplace, JSColor, Keybinds, Linkify, Main, MascotTools, Mascots, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, Report, ReportLink, RevealSpoilers, Rice, Sauce, Settings, Style, ThemeTools, Themes, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, editMascot, editTheme, g, userNavigation,
+  var $, $$, Anonymize, ArchiveLink, Banner, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, GlobalMessage, Header, Icons, ImageExpand, ImageHover, ImageReplace, JSColor, Keybinds, Linkify, Main, MascotTools, Mascots, Menu, MutationObserver, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, Report, ReportLink, RevealSpoilers, Rice, Sauce, Settings, Style, ThemeTools, Themes, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, editMascot, editTheme, g, userNavigation,
     __slice = [].slice,
     __hasProp = {}.hasOwnProperty,
     __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };
@@ -329,6 +329,8 @@
     posts: {}
   };
 
+  MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.OMutationObserver;
+
   Mascots = {
     'Akiyama_Mio': {
       category: 'Anime',
@@ -9615,7 +9617,7 @@
         }), this.ready.bind(this));
       },
       ready: function() {
-        var MutationObserver, imgContainer, input, observer, setLifetime,
+        var imgContainer, input, observer, setLifetime,
           _this = this;
 
         setLifetime = function(e) {
@@ -9641,7 +9643,7 @@
           img: imgContainer.firstChild,
           input: input
         };
-        if (MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.OMutationObserver) {
+        if (MutationObserver) {
           observer = new MutationObserver(this.load.bind(this));
           observer.observe(this.nodes.challenge, {
             childList: true
@@ -10541,15 +10543,22 @@
       return this.cb = QuoteThreading.nodeinsert;
     },
     nodeinsert: function() {
-      var posts, qpost, qroot, threadContainer;
+      var bottom, height, posts, qpost, qroot, threadContainer, top, _ref;
 
       posts = g.posts;
       qpost = posts[this.threaded];
       delete this.threaded;
       delete this.cb;
-      if (this.thread.OP === qpost || (QuoteThreading.hasRun && !Unread.posts.contains(qpost))) {
+      if (this.thread.OP === qpost) {
         return false;
       }
+      if (QuoteThreading.hasRun) {
+        height = doc.clientHeight;
+        _ref = qpost.nodes.root.getBoundingClientRect(), bottom = _ref.bottom, top = _ref.top;
+        if (!(Unread.posts.contains(qpost) || ((bottom < height) && (top > 0)))) {
+          return false;
+        }
+      }
       qroot = qpost.nodes.root;
       threadContainer = qroot.nextSibling;
       if ((threadContainer != null ? threadContainer.className : void 0) !== 'threadContainer') {
diff --git a/builds/crx.crx b/builds/crx.crx
index c293e8fc0..ce63318d9 100644
Binary files a/builds/crx.crx and b/builds/crx.crx differ
diff --git a/builds/crx/script.js b/builds/crx/script.js
index 39e6a9961..3423622c1 100644
--- a/builds/crx/script.js
+++ b/builds/crx/script.js
@@ -1,5 +1,5 @@
 (function() {
-  var $, $$, Anonymize, ArchiveLink, Banner, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, GlobalMessage, Header, Icons, ImageExpand, ImageHover, ImageReplace, JSColor, Keybinds, Linkify, Main, MascotTools, Mascots, Menu, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, Report, ReportLink, RevealSpoilers, Rice, Sauce, Settings, Style, ThemeTools, Themes, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, editMascot, editTheme, g, userNavigation,
+  var $, $$, Anonymize, ArchiveLink, Banner, Board, Build, CatalogLinks, Clone, Conf, Config, CustomCSS, DataBoard, DataBoards, DeleteLink, DownloadLink, Emoji, ExpandComment, ExpandThread, FappeTyme, Favicon, FileInfo, Filter, Fourchan, Get, GlobalMessage, Header, Icons, ImageExpand, ImageHover, ImageReplace, JSColor, Keybinds, Linkify, Main, MascotTools, Mascots, Menu, MutationObserver, Nav, Notification, PSAHiding, Polyfill, Post, PostHiding, QR, QuoteBacklink, QuoteCT, QuoteInline, QuoteOP, QuotePreview, QuoteStrikeThrough, QuoteThreading, QuoteYou, Quotify, Recursive, Redirect, RelativeDates, Report, ReportLink, RevealSpoilers, Rice, Sauce, Settings, Style, ThemeTools, Themes, Thread, ThreadExcerpt, ThreadHiding, ThreadStats, ThreadUpdater, ThreadWatcher, Time, UI, Unread, c, d, doc, editMascot, editTheme, g, userNavigation,
     __slice = [].slice,
     __hasProp = {}.hasOwnProperty,
     __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };
@@ -285,6 +285,8 @@
     posts: {}
   };
 
+  MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.OMutationObserver;
+
   Mascots = {
     'Akiyama_Mio': {
       category: 'Anime',
@@ -9537,7 +9539,7 @@
         }), this.ready.bind(this));
       },
       ready: function() {
-        var MutationObserver, imgContainer, input, observer, setLifetime,
+        var imgContainer, input, observer, setLifetime,
           _this = this;
 
         setLifetime = function(e) {
@@ -9563,7 +9565,7 @@
           img: imgContainer.firstChild,
           input: input
         };
-        if (MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.OMutationObserver) {
+        if (MutationObserver) {
           observer = new MutationObserver(this.load.bind(this));
           observer.observe(this.nodes.challenge, {
             childList: true
@@ -10444,15 +10446,22 @@
       return this.cb = QuoteThreading.nodeinsert;
     },
     nodeinsert: function() {
-      var posts, qpost, qroot, threadContainer;
+      var bottom, height, posts, qpost, qroot, threadContainer, top, _ref;
 
       posts = g.posts;
       qpost = posts[this.threaded];
       delete this.threaded;
       delete this.cb;
-      if (this.thread.OP === qpost || (QuoteThreading.hasRun && !Unread.posts.contains(qpost))) {
+      if (this.thread.OP === qpost) {
         return false;
       }
+      if (QuoteThreading.hasRun) {
+        height = doc.clientHeight;
+        _ref = qpost.nodes.root.getBoundingClientRect(), bottom = _ref.bottom, top = _ref.top;
+        if (!(Unread.posts.contains(qpost) || ((bottom < height) && (top > 0)))) {
+          return false;
+        }
+      }
       qroot = qpost.nodes.root;
       threadContainer = qroot.nextSibling;
       if ((threadContainer != null ? threadContainer.className : void 0) !== 'threadContainer') {
diff --git a/src/code/globals.coffee b/src/code/globals.coffee
index 7c4114364..b68fb2c2e 100644
--- a/src/code/globals.coffee
+++ b/src/code/globals.coffee
@@ -19,6 +19,8 @@ g    =
   threads:   {}
   posts:     {}
 
+MutationObserver = window.MutationObserver or window.WebKitMutationObserver or window.OMutationObserver
+
 Mascots =
   'Akiyama_Mio':
     category:   'Anime'
diff --git a/src/code/posting/qr.coffee b/src/code/posting/qr.coffee
index e2f878ffc..5eba07abe 100644
--- a/src/code/posting/qr.coffee
+++ b/src/code/posting/qr.coffee
@@ -671,7 +671,7 @@ QR =
         img:       imgContainer.firstChild
         input:     input
 
-      if MutationObserver = window.MutationObserver or window.WebKitMutationObserver or window.OMutationObserver
+      if MutationObserver
         observer = new MutationObserver @load.bind @
         observer.observe @nodes.challenge,
           childList: true
diff --git a/src/code/quoting/quotethreading.coffee b/src/code/quoting/quotethreading.coffee
index 185e70ed8..837e74c29 100644
--- a/src/code/quoting/quotethreading.coffee
+++ b/src/code/quoting/quotethreading.coffee
@@ -62,7 +62,14 @@ QuoteThreading =
     delete @threaded
     delete @cb
 
-    return false if @thread.OP is qpost or (QuoteThreading.hasRun and !Unread.posts.contains qpost)
+    return false if @thread.OP is qpost 
+    
+    if QuoteThreading.hasRun
+      height  = doc.clientHeight
+      {bottom, top} = qpost.nodes.root.getBoundingClientRect()
+
+      # Post is unread or is fully visible.
+      return false unless Unread.posts.contains(qpost) or ((bottom < height) and (top > 0))
 
     qroot = qpost.nodes.root
     threadContainer = qroot.nextSibling