Avoid using {d.body,doc}.scroll{Top,Left}, use window.scroll[...] instead.

src/General/Header.coffee

@@ -248,8 +248,8 @@ Header =
     {top} = post.getBoundingClientRect()
     unless Conf['Bottom header']
       headRect = Header.toggle.getBoundingClientRect()
-      top += - headRect.top - headRect.height
-    <% if (type === 'crx') { %>d.body<% } else { %>doc<% } %>.scrollTop += top
+      top -= headRect.top + headRect.height
+    window.scrollBy 0, top
 
   addShortcut: (el) ->
     shortcut = $.el 'span',

src/General/UI.coffee

@@ -63,8 +63,8 @@ UI = do ->
       # Position
       mRect   = menu.getBoundingClientRect()
       bRect   = button.getBoundingClientRect()
-      bTop    = doc.scrollTop  + d.body.scrollTop  + bRect.top
-      bLeft   = doc.scrollLeft + d.body.scrollLeft + bRect.left
+      bTop    = window.scrollY + bRect.top
+      bLeft   = window.scrollX + bRect.left
       cHeight = doc.clientHeight
       cWidth  = doc.clientWidth
       [top, bottom] = if bRect.top + bRect.height + mRect.height < cHeight

src/Images/ImageExpand.coffee

@@ -59,17 +59,18 @@ ImageExpand =
       ImageExpand.expand post
       return
     ImageExpand.contract post
-    rect = post.nodes.root.getBoundingClientRect()
-    return unless rect.top <= 0 or rect.left <= 0
+
     # Scroll back to the thumbnail when contracting the image
     # to avoid being left miles away from the relevant post.
-    {top} = rect
-    unless Conf['Bottom header']
-      headRect = Header.toggle.getBoundingClientRect()
-      top += - headRect.top - headRect.height
-    root = <% if (type === 'crx') { %>d.body<% } else { %>doc<% } %>
-    root.scrollTop += top if rect.top  < 0
-    root.scrollLeft = 0   if rect.left < 0
+    rect = post.nodes.root.getBoundingClientRect()
+    if rect.top < 0
+      y = rect.top
+      unless Conf['Bottom header']
+        headRect = Header.toggle.getBoundingClientRect()
+        y -= headRect.top + headRect.height
+    if rect.left < 0
+      x = -window.scrollX
+    window.scrollBy x, y if x or y
 
   contract: (post) ->
     $.rmClass post.nodes.root, 'expanded-image'
@@ -109,9 +110,8 @@ ImageExpand =
       $.addClass post.nodes.root, 'expanded-image'
       $.rmClass  post.file.thumb, 'expanding'
       return unless prev.top + prev.height <= 0
-      root = <% if (type === 'crx') { %>d.body<% } else { %>doc<% } %>
       curr = post.nodes.root.getBoundingClientRect()
-      root.scrollTop += curr.height - prev.height + curr.top - prev.top
+      window.scrollBy 0, curr.height - prev.height + curr.top - prev.top
 
   error: ->
     post = Get.postFromNode @

src/Monitoring/ThreadUpdater.coffee

@@ -262,7 +262,7 @@ ThreadUpdater =
     sendEvent()
     if scroll
       if Conf['Bottom Scroll']
-        <% if (type === 'crx') { %>d.body<% } else { %>doc<% } %>.scrollTop = d.body.clientHeight
+        window.scrollTo 0, d.body.clientHeight
       else
         Header.scrollToPost nodes[0]