WebExtensions doesn't like protocol relative URLs in AJAX requests.

src/General/BoardConfig.coffee

@@ -4,7 +4,7 @@ BoardConfig =
   init: ->
     now = Date.now()
     unless now - 2 * $.HOUR < (Conf['boardConfig'].lastChecked or 0) <= now
-      $.ajax '//a.4cdn.org/boards.json',
+      $.ajax "#{location.protocol}//a.4cdn.org/boards.json",
         onloadend: @load
     else
       @set Conf['boardConfig'].boards

src/General/Build.Test.coffee

@@ -65,7 +65,7 @@ Build.Test =
 
   testOne: (post) ->
     Build.Test.postsRemaining++
-    $.cache "//a.4cdn.org/#{post.board.ID}/thread/#{post.thread.ID}.json", ->
+    $.cache "#{location.protocol}//a.4cdn.org/#{post.board.ID}/thread/#{post.thread.ID}.json", ->
       {posts} = @response
       Build.spoilerRange[post.board.ID] = posts[0].custom_spoiler
       for postData in posts

src/General/Index.coffee

@@ -591,7 +591,7 @@ Index =
       location.reload()
       return
 
-    Index.req = $.ajax "//a.4cdn.org/#{g.BOARD}/catalog.json",
+    Index.req = $.ajax "#{location.protocol}//a.4cdn.org/#{g.BOARD}/catalog.json",
       onabort:   Index.load
       onloadend: Index.load
     ,

src/Images/ImageCommon.coffee

@@ -54,7 +54,7 @@ ImageCommon =
         clearTimeout timeoutID if delay?
         cb URL
 
-    $.ajax "//a.4cdn.org/#{post.board}/thread/#{post.thread}.json", onload: ->
+    $.ajax "#{location.protocol}//a.4cdn.org/#{post.board}/thread/#{post.thread}.json", onload: ->
       post.kill !post.isClone if @status is 404
       return redirect() if @status isnt 200
       for postObj in @response.posts

src/Linkification/Embedding.coffee

@@ -376,7 +376,7 @@ Embedding =
         $.el 'iframe',
           src: "https://w.soundcloud.com/player/?visual=true&show_comments=false&url=https%3A%2F%2Fsoundcloud.com%2F#{encodeURIComponent a.dataset.uid}"
       title:
-        api: (uid) -> "//soundcloud.com/oembed?format=json&url=https%3A%2F%2Fsoundcloud.com%2F#{encodeURIComponent uid}"
+        api: (uid) -> "#{location.protocol}//soundcloud.com/oembed?format=json&url=https%3A%2F%2Fsoundcloud.com%2F#{encodeURIComponent uid}"
         text: (_) -> _.title
     ,
       key: 'StrawPoll'

src/Miscellaneous/ExpandComment.coffee

@@ -26,7 +26,7 @@ ExpandComment =
       return
     return if not (a = $ '.abbr > a', post.nodes.comment)
     a.textContent = "Post No.#{post} Loading..."
-    $.cache "//a.4cdn.org#{a.pathname.split(/\/+/).splice(0,4).join('/')}.json", -> ExpandComment.parse @, a, post
+    $.cache "#{location.protocol}//a.4cdn.org#{a.pathname.split(/\/+/).splice(0,4).join('/')}.json", -> ExpandComment.parse @, a, post
 
   contract: (post) ->
     return unless post.nodes.shortComment

src/Miscellaneous/ExpandThread.coffee

@@ -43,7 +43,7 @@ ExpandThread =
   expand: (thread, a) ->
     ExpandThread.statuses[thread] = status = {}
     a.textContent = Build.summaryText '...', a.textContent.match(/\d+/g)...
-    status.req = $.cache "//a.4cdn.org/#{thread.board}/thread/#{thread}.json", ->
+    status.req = $.cache "#{location.protocol}//a.4cdn.org/#{thread.board}/thread/#{thread}.json", ->
       delete status.req
       ExpandThread.parse @, thread, a
 

src/Monitoring/ThreadStats.coffee

@@ -75,7 +75,7 @@ ThreadStats =
       $.addClass ThreadStats.pageCountEl, 'warning'
       return
     ThreadStats.timeout = setTimeout ThreadStats.fetchPage, 2 * $.MINUTE
-    $.ajax "//a.4cdn.org/#{ThreadStats.thread.board}/threads.json", onload: ThreadStats.onThreadsLoad,
+    $.ajax "#{location.protocol}//a.4cdn.org/#{ThreadStats.thread.board}/threads.json", onload: ThreadStats.onThreadsLoad,
       whenModified: 'ThreadStats'
 
   onThreadsLoad: ->

src/Monitoring/ThreadUpdater.coffee

@@ -138,7 +138,7 @@ ThreadUpdater =
             ThreadUpdater.setInterval()
         when 404
           # XXX workaround for 4chan sending false 404s
-          $.ajax "//a.4cdn.org/#{ThreadUpdater.thread.board}/catalog.json", onloadend: ->
+          $.ajax "#{location.protocol}//a.4cdn.org/#{ThreadUpdater.thread.board}/catalog.json", onloadend: ->
             if @status is 200
               confirmed = true
               for page in @response
@@ -231,7 +231,7 @@ ThreadUpdater =
     clearTimeout ThreadUpdater.timeoutID
     ThreadUpdater.set 'timer', '...', 'loading'
     ThreadUpdater.req?.abort()
-    ThreadUpdater.req = $.ajax "//a.4cdn.org/#{ThreadUpdater.thread.board}/thread/#{ThreadUpdater.thread}.json",
+    ThreadUpdater.req = $.ajax "#{location.protocol}//a.4cdn.org/#{ThreadUpdater.thread.board}/thread/#{ThreadUpdater.thread}.json",
       onloadend: ThreadUpdater.cb.load
       timeout:   $.MINUTE
     ,

src/Monitoring/ThreadWatcher.coffee

@@ -211,7 +211,7 @@ ThreadWatcher =
     if ThreadWatcher.requests.length is 0
       ThreadWatcher.status.textContent = '...'
       $.addClass ThreadWatcher.refreshButton, 'fa-spin'
-    req = $.ajax "//a.4cdn.org/#{boardID}/thread/#{threadID}.json",
+    req = $.ajax "#{location.protocol}//a.4cdn.org/#{boardID}/thread/#{threadID}.json",
       onloadend: ->
         ThreadWatcher.parseStatus.call @, thread
       timeout: $.MINUTE

src/classes/DataBoard.coffee

@@ -91,9 +91,9 @@ class DataBoard
     return
 
   ajaxClean: (boardID) ->
-    $.cache "//a.4cdn.org/#{boardID}/threads.json", (e1) =>
+    $.cache "#{location.protocol}//a.4cdn.org/#{boardID}/threads.json", (e1) =>
       return unless e1.target.status in [200, 404]
-      $.cache "//a.4cdn.org/#{boardID}/archive.json", (e2) =>
+      $.cache "#{location.protocol}//a.4cdn.org/#{boardID}/archive.json", (e2) =>
         return unless e2.target.status in [200, 404]
         @ajaxCleanParse boardID, e1.target.response, e2.target.response
 

src/classes/Fetcher.coffee

@@ -15,7 +15,7 @@ class Fetcher
 
     @root.textContent = "Loading post No.#{@postID}..."
     if @threadID
-      $.cache "//a.4cdn.org/#{@boardID}/thread/#{@threadID}.json", (e, isCached) =>
+      $.cache "#{location.protocol}//a.4cdn.org/#{@boardID}/thread/#{@threadID}.json", (e, isCached) =>
         @fetchedPost e.target, isCached
     else
       @archivedPost()
@@ -78,7 +78,7 @@ class Fetcher
     if post.no isnt @postID
       # Cached requests can be stale and must be rechecked.
       if isCached
-        api = "//a.4cdn.org/#{@boardID}/thread/#{@threadID}.json"
+        api = "#{location.protocol}//a.4cdn.org/#{@boardID}/thread/#{@threadID}.json"
         $.cleanCache (url) -> url is api
         $.cache api, (e) =>
           @fetchedPost e.target, false

src/main/Main.coffee

@@ -315,7 +315,7 @@ Main =
         threads[0].ipCount   = if m = scriptData.match /\bunique_ips *= *(\d+)\b/ then +m[1]
 
       if g.BOARD.ID is 'f' and g.VIEW is 'thread'
-        $.ajax "//a.4cdn.org/f/thread/#{g.THREADID}.json",
+        $.ajax "#{location.protocol}//a.4cdn.org/f/thread/#{g.THREADID}.json",
           timeout: $.MINUTE
           onloadend: ->
             if @response and posts[0].file