diff --git a/src/Filtering/Filter.coffee b/src/Filtering/Filter.coffee
index abdd13b350..c2fe2a35f7 100644
--- a/src/Filtering/Filter.coffee
+++ b/src/Filtering/Filter.coffee
@@ -157,7 +157,7 @@ Filter =
 
   node: ->
     return if @isClone
-    {hide, stub, hl, top, noti} = Filter.test @, (!@isFetchedQuote and (@isReply or g.VIEW is 'index'))
+    {hide, stub, hl, noti} = Filter.test @, (!@isFetchedQuote and (@isReply or g.VIEW is 'index'))
     if hide
       if @isReply
         PostHiding.hide @, stub
diff --git a/src/General/Settings.coffee b/src/General/Settings.coffee
index 962355ad1c..d3aa86f46f 100644
--- a/src/General/Settings.coffee
+++ b/src/General/Settings.coffee
@@ -323,7 +323,7 @@ Settings =
             '%board'
           else
             c
-      for key, val of Config.hotkeys when key of data.Conf
+      for key of Config.hotkeys when key of data.Conf
         data.Conf[key] = data.Conf[key].replace(/ctrl|alt|meta/g, (s) -> "#{s[0].toUpperCase()}#{s[1..]}").replace /(^|.+\+)[A-Z]$/g, (s) ->
           "Shift+#{s[0...-1]}#{s[-1..].toLowerCase()}"
       if data.WatchedThreads
diff --git a/src/General/UI.coffee b/src/General/UI.coffee
index 929f85278c..d1dcbe0934 100644
--- a/src/General/UI.coffee
+++ b/src/General/UI.coffee
@@ -81,8 +81,6 @@ class Menu
   setPosition: =>
     mRect   = @menu.getBoundingClientRect()
     bRect   = lastToggledButton.getBoundingClientRect()
-    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
diff --git a/src/Linkification/Embedding.coffee b/src/Linkification/Embedding.coffee
index b6fc25c193..dc8d0784cb 100644
--- a/src/Linkification/Embedding.coffee
+++ b/src/Linkification/Embedding.coffee
@@ -103,7 +103,7 @@ Embedding =
     style.pointerEvents = 'none'
 
   title: (data) ->
-    {key, uid, options, link, post} = data
+    {key, uid, link} = data
     return if not (service = Embedding.types[key].title)
     $.addClass link, key.toLowerCase()
     if service.batchSize
@@ -179,7 +179,7 @@ Embedding =
     title: (req, data) ->
       return unless req.status
 
-      {key, uid, options, link, post} = data
+      {key, uid, link, post} = data
       {status} = req
       service = Embedding.types[key].title
 
diff --git a/src/Monitoring/ThreadUpdater.coffee b/src/Monitoring/ThreadUpdater.coffee
index 69f03d7662..2a23bf1ae8 100644
--- a/src/Monitoring/ThreadUpdater.coffee
+++ b/src/Monitoring/ThreadUpdater.coffee
@@ -155,6 +155,7 @@ ThreadUpdater =
               ThreadUpdater.error @
         else
           ThreadUpdater.error @
+      return
 
   kill: ->
     ThreadUpdater.thread.kill()
diff --git a/src/Posting/Captcha.fixes.coffee b/src/Posting/Captcha.fixes.coffee
index e5640e9be6..a3ea4289a2 100644
--- a/src/Posting/Captcha.fixes.coffee
+++ b/src/Posting/Captcha.fixes.coffee
@@ -106,7 +106,6 @@ Captcha.fixes =
       @addTooltips16 @images
 
   addLabels: ->
-    imageSelect = $ '.fbc-payload-imageselect'
     labels = for checkbox, i in @images
       checkbox.id = "checkbox-#{i}"
       label = $.el 'label',
diff --git a/src/classes/DataBoard.coffee b/src/classes/DataBoard.coffee
index 3f245b369c..fed3202788 100644
--- a/src/classes/DataBoard.coffee
+++ b/src/classes/DataBoard.coffee
@@ -121,7 +121,7 @@ class DataBoard
 
   clean: ->
     siteID = g.SITE.ID
-    for boardID, val of @data[siteID].boards
+    for boardID of @data[siteID].boards
       @deleteIfEmpty {siteID, boardID}
     now = Date.now()
     unless now - 2 * $.HOUR < (@data[siteID].lastChecked or 0) <= now
diff --git a/src/platform/CrossOrigin.coffee b/src/platform/CrossOrigin.coffee
index bc54477f9b..e5e455705c 100644
--- a/src/platform/CrossOrigin.coffee
+++ b/src/platform/CrossOrigin.coffee
@@ -143,11 +143,11 @@ CrossOrigin.ajax = (url, options={}) ->
     timeout
     onload: (xhr) ->
       try
-        response = switch responseType
+        switch responseType
           when 'json'
-            if xhr.responseText then JSON.parse(xhr.responseText) else null
+            response = if xhr.responseText then JSON.parse(xhr.responseText) else null
           else
-            xhr.responseText
+            response = xhr.responseText
         $.extend req, {
           response
           status: xhr.status