Fix Firefox extension content script #257 (#258)

Author: resurtm

src/ResizeSensor.js

@@ -19,14 +19,21 @@
     if (typeof window === "undefined") {
         return null;
     }
+    // https://github.com/Semantic-Org/Semantic-UI/issues/3855
+    // https://github.com/marcj/css-element-queries/issues/257
+    var globalWindow = typeof window != 'undefined' && window.Math == Math
+        ? window
+        : typeof self != 'undefined' && self.Math == Math
+            ? self
+            : Function('return this')();
     // Only used for the dirty checking, so the event callback count is limited to max 1 call per fps per sensor.
     // In combination with the event based resize sensor this saves cpu time, because the sensor is too fast and
     // would generate too many unnecessary events.
-    var requestAnimationFrame = window.requestAnimationFrame ||
-        window.mozRequestAnimationFrame ||
-        window.webkitRequestAnimationFrame ||
+    var requestAnimationFrame = globalWindow.requestAnimationFrame ||
+        globalWindow.mozRequestAnimationFrame ||
+        globalWindow.webkitRequestAnimationFrame ||
         function (fn) {
-            return window.setTimeout(fn, 20);
+            return globalWindow.setTimeout(fn, 20);
         };
 
     /**