Use a closure with a private variable for $.cache's requests.

4chan_x.user.js

@@ -369,37 +369,40 @@
       r.send(form);
       return r;
     },
-    cache: function(url, cb) {
+    cache: (function() {
-      var req, reqs, _base;
+      var reqs;
-      reqs = (_base = $.cache).requests || (_base.requests = {});
+      reqs = {};
-      if (req = reqs[url]) {
+      return function(url, cb) {
-        if (req.readyState === 4) {
+        var req;
-          cb.call(req);
+        if (req = reqs[url]) {
-        } else {
+          if (req.readyState === 4) {
-          req.callbacks.push(cb);
+            cb.call(req);
-        }
+          } else {
-        return;
+            req.callbacks.push(cb);
-      }
-      req = $.ajax(url, {
-        onload: function() {
-          var _i, _len, _ref;
-          _ref = this.callbacks;
-          for (_i = 0, _len = _ref.length; _i < _len; _i++) {
-            cb = _ref[_i];
-            cb.call(this);
           }
-          return delete this.callbacks;
+          return;
-        },
-        onabort: function() {
-          return delete reqs[url];
-        },
-        onerror: function() {
-          return delete reqs[url];
         }
-      });
+        req = $.ajax(url, {
-      req.callbacks = [cb];
+          onload: function() {
-      return reqs[url] = req;
+            var _i, _len, _ref;
-    },
+            _ref = this.callbacks;
+            for (_i = 0, _len = _ref.length; _i < _len; _i++) {
+              cb = _ref[_i];
+              cb.call(this);
+            }
+            return delete this.callbacks;
+          },
+          onabort: function() {
+            return delete reqs[url];
+          },
+          onerror: function() {
+            return delete reqs[url];
+          }
+        });
+        req.callbacks = [cb];
+        return reqs[url] = req;
+      };
+    })(),
     cb: {
       checked: function() {
         $.set(this.name, this.checked);

script.coffee

@@ -295,22 +295,24 @@ $.extend $,
     $.extend r.upload, upCallbacks
     r.send form
     r
-  cache: (url, cb) ->
+  cache: (->
-    reqs = $.cache.requests or= {}
+    reqs = {}
-    if req = reqs[url]
+    (url, cb) ->
-      if req.readyState is 4
+      if req = reqs[url]
-        cb.call req
+        if req.readyState is 4
-      else
+          cb.call req
-        req.callbacks.push cb
+        else
-      return
+          req.callbacks.push cb
-    req = $.ajax url,
+        return
-      onload:  ->
+      req = $.ajax url,
-        cb.call @ for cb in @callbacks
+        onload:  ->
-        delete @callbacks
+          cb.call @ for cb in @callbacks
-      onabort: -> delete reqs[url]
+          delete @callbacks
-      onerror: -> delete reqs[url]
+        onabort: -> delete reqs[url]
-    req.callbacks = [cb]
+        onerror: -> delete reqs[url]
-    reqs[url] = req
+      req.callbacks = [cb]
+      reqs[url] = req
+  )()
   cb:
     checked: ->
       $.set @name, @checked