diff --git a/CHANGELOG.md b/CHANGELOG.md
index 563e78db2..32ed3acb3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,10 @@
 
 ### v1.13.15
 
+**v1.13.15.6** *(2018-01-25)* - [[Userscript](https://raw.githubusercontent.com/ccd0/4chan-x/1.13.15.6/builds/4chan-X-noupdate.user.js)] [[Chrome extension](https://raw.githubusercontent.com/ccd0/4chan-x/1.13.15.6/builds/4chan-X-noupdate.crx)]
+- Bugfix to captcha opening logic. Don't ask user for new captchas when we have a bypass cookie or at least one captcha, even when many posts are queued.
+- Don't save captchas to disk or share them between tabs. They are too short-lived to be worth it now. This should reduce associated I/O errors.
+
 **v1.13.15.5** *(2018-01-23)* - [[Userscript](https://raw.githubusercontent.com/ccd0/4chan-x/1.13.15.5/builds/4chan-X-noupdate.user.js)] [[Chrome extension](https://raw.githubusercontent.com/ccd0/4chan-x/1.13.15.5/builds/4chan-X-noupdate.crx)]
 - Add link in settings to captcha FAQ.
 
diff --git a/src/Posting/Captcha.cache.coffee b/src/Posting/Captcha.cache.coffee
index a6621ba2c..bbd20657f 100644
--- a/src/Posting/Captcha.cache.coffee
+++ b/src/Posting/Captcha.cache.coffee
@@ -1,9 +1,5 @@
 Captcha.cache =
   init: ->
-    $.get 'captchas', [], ({captchas}) =>
-      @sync captchas
-      @clear()
-    $.sync 'captchas', @sync.bind(@)
     $.on d, 'SaveCaptcha', (e) =>
       @save e.detail
 
@@ -13,44 +9,34 @@ Captcha.cache =
     @captchas.length
 
   needed: ->
-    captchaCount = @captchas.length
-    captchaCount++ if QR.req or /\b_ct=/.test(d.cookie)
-    postsCount = QR.posts.length
-    postsCount = 0 if postsCount is 1 and !Conf['Auto-load captcha'] and !QR.posts[0].com and !QR.posts[0].file
-    captchaCount < postsCount
-
-  sync: (captchas=[]) ->
-    captchas = [] unless captchas instanceof Array
-    @captchas = captchas
-    @count()
+    not (
+      /\b_ct=/.test(d.cookie) or @captchas.length or QR.req
+    ) and (
+      QR.posts.length > 1 or Conf['Auto-load captcha'] or QR.posts[0].com or QR.posts[0].file
+    )
 
   getOne: (isReply) ->
     @clear()
     i = @captchas.findIndex((x) -> isReply or !x.challenge?)
     if i >= 0
       captcha = @captchas.splice(i, 1)[0]
-      $.set 'captchas', @captchas
       @count()
       captcha
     else
       null
 
   save: (captcha) ->
-    $.forceSync 'captchas'
     @captchas.push captcha
     @captchas.sort (a, b) -> a.timeout - b.timeout
-    $.set 'captchas', @captchas
     @count()
 
   clear: ->
-    $.forceSync 'captchas'
     if @captchas.length
       now = Date.now()
       for captcha, i in @captchas
         break if captcha.timeout > now
       if i
         @captchas = @captchas[i..]
-        $.set 'captchas', @captchas
         @count()
 
   count: ->
diff --git a/src/platform/$.coffee b/src/platform/$.coffee
index 8407d0efd..201a4d479 100644
--- a/src/platform/$.coffee
+++ b/src/platform/$.coffee
@@ -671,7 +671,7 @@ else
     # XXX https://github.com/greasemonkey/greasemonkey/issues/2033
     # Also support case where GM_listValues is not defined.
     $.delete Object.keys(Conf)
-    $.delete ['previousversion', 'QR Size', 'captchas', 'QR.persona', 'hiddenPSA']
+    $.delete ['previousversion', 'QR Size', 'QR.persona', 'hiddenPSA']
     try
       $.delete $.listValues().map (key) -> key.replace g.NAMESPACE, ''
     cb?()