Fix race condition causing unread posts tracking to malfunction.

src/Monitoring/Favicon.coffee

@@ -1,13 +1,22 @@
 Favicon =
   init: ->
     $.asap (-> d.head and (Favicon.el = $ 'link[rel="shortcut icon"]', d.head)), Favicon.initAsap
-  
+
+  set: (status) ->
+    Favicon.status = status
+    if Favicon.el
+      Favicon.el.href = Favicon[status]
+      # `favicon.href = href` doesn't work on Firefox.
+      $.add d.head, Favicon.el
+
   initAsap: ->
     Favicon.el.type = 'image/x-icon'
     {href}          = Favicon.el
     Favicon.isSFW   = /ws\.ico$/.test href
     Favicon.default = href
     Favicon.switch()
+    if Favicon.status
+      Favicon.set Favicon.status
 
   switch: ->
     items = {

src/Monitoring/Unread.coffee

@@ -236,15 +236,14 @@ Unread =
 
     if Conf['Unread Favicon'] and g.SITE.software is 'yotsuba'
       {isDead} = Unread.thread
-      Favicon.el.href =
+      Favicon.set (
         if countQuotingYou
-          Favicon[if isDead then 'unreadDeadY' else 'unreadY']
+          (if isDead then 'unreadDeadY' else 'unreadY')
         else if count
-          Favicon[if isDead then 'unreadDead' else 'unread']
+          (if isDead then 'unreadDead' else 'unread')
         else
-          Favicon[if isDead then 'dead' else 'default']
-      # `favicon.href = href` doesn't work on Firefox.
-      $.add d.head, Favicon.el
+          (if isDead then 'dead' else 'default')
+      )
 
   saveThreadWatcherCount: $.debounce 2 * $.SECOND, ->
     $.forceSync 'Remember Last Read Post'