diff --git a/4chan_x.js b/4chan_x.js
index fa8c3007e..166e73ab2 100644
--- a/4chan_x.js
+++ b/4chan_x.js
@@ -998,6 +998,7 @@
               $.remove(dialog);
             }
           }
+          qr.cooldown(true);
         }
         Recaptcha.reload();
         return $('iframe[name=iframe]').src = 'about:blank';
@@ -1021,9 +1022,8 @@
             $.remove(span);
           }
         }
-        if (g.seconds = $.getValue('seconds')) {
+        if (qr.cooldown()) {
           e.preventDefault();
-          qr.cooldownStart();
           alert('Stop posting so often!');
           if (isQR) {
             span = $.el('span', {
@@ -1036,7 +1036,7 @@
         }
         recaptcha = $('input[name=recaptcha_response_field]', this);
         if (recaptcha.value) {
-          g.sage = $('input[name=email]', form).value === 'sage';
+          qr.sage = $('input[name=email]', form).value === 'sage';
           if (isQR) {
             return qr.autohide.set();
           }
@@ -1085,34 +1085,50 @@
       f = $('input[type=file]', dialog).parentNode;
       return f.innerHTML = f.innerHTML;
     },
-    cooldown: function() {
+    cooldown: function(restart) {
+      var duration, end, now;
+      now = Date.now();
+      if (restart) {
+        duration = qr.sage ? 60 : 30;
+        qr.cooldownStart(duration);
+        $.setValue("" + g.BOARD + "/cooldown", now + duration * 1000);
+        return;
+      }
+      end = $.getValue("" + g.BOARD + "/cooldown", 0);
+      if (now < end) {
+        duration = Math.ceil((end - now) / 1000);
+        qr.cooldownStart(duration);
+        return true;
+      }
+    },
+    cooldownStart: function(duration) {
       var submit, submits, _i, _len;
       submits = $$('#qr input[type=submit], form[name=post] input[type=submit]');
       for (_i = 0, _len = submits.length; _i < _len; _i++) {
         submit = submits[_i];
-        if (g.seconds === 0) {
+        submit.value = duration;
+        submit.disabled = true;
+      }
+      qr.cooldownIntervalID = window.setInterval(qr.cooldownCB, 1000);
+      return qr.duration = duration;
+    },
+    cooldownCB: function() {
+      var submit, submits, _i, _len;
+      qr.duration = qr.duration - 1;
+      submits = $$('#qr input[type=submit], form[name=post] input[type=submit]');
+      for (_i = 0, _len = submits.length; _i < _len; _i++) {
+        submit = submits[_i];
+        if (qr.duration === 0) {
           submit.disabled = false;
           submit.value = 'Submit';
         } else {
-          submit.value = g.seconds = g.seconds - 1;
-          $.setValue('seconds', g.seconds);
+          submit.value = qr.duration;
         }
       }
-      if (g.seconds !== 0) {
-        return window.setTimeout(qr.cooldown, 1000);
+      if (qr.duration === 0) {
+        return clearInterval(qr.cooldownIntervalID);
       }
     },
-    cooldownStart: function() {
-      var submit, submits, _i, _len;
-      $.setValue('seconds', g.seconds);
-      submits = $$('#qr input[type=submit], form[name=post] input[type=submit]');
-      for (_i = 0, _len = submits.length; _i < _len; _i++) {
-        submit = submits[_i];
-        submit.value = g.seconds;
-        submit.disabled = true;
-      }
-      return window.setTimeout(qr.cooldown, 1000);
-    },
     dialog: function(link) {
       var clone, dialog, el, html, resto, script, xpath, _i, _len, _ref;
       html = "<div class=move>Quick Reply <input type=checkbox title=autohide> <a name=close title=close>X</a></div>";
@@ -2096,6 +2112,7 @@
       $.addStyle(main.css);
       Recaptcha.init();
       $.bind($('form[name=post]'), 'submit', qr.cb.submit);
+      qr.cooldown();
       if ($.config('Image Expansion')) {
         imgExpand.init();
       }
diff --git a/script.coffee b/script.coffee
index 269f7aa56..22d6068a1 100644
--- a/script.coffee
+++ b/script.coffee
@@ -743,12 +743,13 @@ qr =
           textContent: data
         $.append dialog, error
         qr.autohide.unset()
-      else
+      else # success
         if dialog
           if $.config 'Persistent QR'
             qr.refresh dialog
           else
             $.remove dialog
+        qr.cooldown true
 
       Recaptcha.reload()
       $('iframe[name=iframe]').src = 'about:blank'
@@ -766,9 +767,9 @@ qr =
         if span = @nextSibling
           $.remove span
 
-      if g.seconds = $.getValue 'seconds'
+      # check if we've posted on this board in another tab
+      if qr.cooldown()
         e.preventDefault()
-        qr.cooldownStart()
         alert 'Stop posting so often!'
 
         if isQR
@@ -781,7 +782,7 @@ qr =
 
       recaptcha = $('input[name=recaptcha_response_field]', this)
       if recaptcha.value
-        g.sage = $('input[name=email]', form).value == 'sage'
+        qr.sage = $('input[name=email]', form).value == 'sage'
         if isQR
           qr.autohide.set()
       else
@@ -825,26 +826,42 @@ qr =
     f = $('input[type=file]', dialog).parentNode
     f.innerHTML = f.innerHTML
 
-  cooldown: ->
+  cooldown: (restart) ->
+    now = Date.now()
+
+    if restart
+      duration = if qr.sage then 60 else 30
+      qr.cooldownStart duration
+      $.setValue "#{g.BOARD}/cooldown", now + duration * 1000
+      return
+
+    end = $.getValue "#{g.BOARD}/cooldown", 0
+    if now < end
+      duration = Math.ceil (end - now) / 1000
+      qr.cooldownStart duration
+      return true
+
+  cooldownStart: (duration) ->
     submits = $$ '#qr input[type=submit], form[name=post] input[type=submit]'
     for submit in submits
-      if g.seconds == 0
+      submit.value = duration
+      submit.disabled = true
+    qr.cooldownIntervalID = window.setInterval qr.cooldownCB, 1000
+    qr.duration = duration
+
+  cooldownCB: ->
+    qr.duration = qr.duration - 1
+
+    submits = $$ '#qr input[type=submit], form[name=post] input[type=submit]'
+    for submit in submits
+      if qr.duration == 0
         submit.disabled = false
         submit.value = 'Submit'
       else
-        submit.value = g.seconds = g.seconds - 1
-        $.setValue 'seconds', g.seconds
+        submit.value = qr.duration
 
-    if g.seconds != 0
-      window.setTimeout qr.cooldown, 1000
-
-  cooldownStart: ->
-    $.setValue 'seconds', g.seconds
-    submits = $$ '#qr input[type=submit], form[name=post] input[type=submit]'
-    for submit in submits
-      submit.value = g.seconds
-      submit.disabled = true
-    window.setTimeout qr.cooldown, 1000
+    if qr.duration == 0
+      clearInterval qr.cooldownIntervalID
 
   dialog: (link) ->
     html = "<div class=move>Quick Reply <input type=checkbox title=autohide> <a name=close title=close>X</a></div>"
@@ -1608,6 +1625,8 @@ main =
 
     $.bind $('form[name=post]'), 'submit', qr.cb.submit
 
+    qr.cooldown()
+
     #major features
     if $.config 'Image Expansion'
       imgExpand.init()