diff --git a/core/main/client/browser.js b/core/main/client/browser.js
index 20d063b42..8a0078e4f 100644
--- a/core/main/client/browser.js
+++ b/core/main/client/browser.js
@@ -413,13 +413,20 @@ beef.browser = {
         return !!window.devicePixelRatio && !!window.history.replaceState && typeof navigator.mozGetUserMedia != "undefined" && (typeof window.crypto != "undefined" && typeof window.crypto.getRandomValues != "undefined") && typeof Math.hypot == 'function' && typeof String.prototype.codePointAt === 'function' && typeof Number.isSafeInteger === 'function' && window.navigator.userAgent.match(/Firefox\/39./) != null;
     },
 
+    /**
+     * Returns true if FF40
+     * @example: beef.browser.isFF40()
+     */
+    isFF40: function () {
+        return !!window.devicePixelRatio && !!window.history.replaceState && typeof navigator.mozGetUserMedia != "undefined" && (typeof window.crypto != "undefined" && typeof window.crypto.getRandomValues != "undefined") && typeof Math.hypot == 'function' && typeof String.prototype.codePointAt === 'function' && typeof Number.isSafeInteger === 'function' && window.navigator.userAgent.match(/Firefox\/40./) != null;
+    },
+
     /**
      * Returns true if FF.
      * @example: beef.browser.isFF()
      */
     isFF: function () {
-        return this.isFF2() || this.isFF3() || this.isFF3_5() || this.isFF3_6() || this.isFF4() || this.isFF5() || this.isFF6() || this.isFF7() || this.isFF8() || this.isFF9() || this.isFF10() || this.isFF11() || this.isFF12() || this.isFF13() || this.isFF14() || this.isFF15() || this.isFF16() || this.isFF17() || this.isFF18() || this.isFF19() || this.isFF20() || this.isFF21() || this.isFF22() || this.isFF23() || this.isFF24() || this.isFF25() || this.isFF26() || this.isFF27() || this.isFF28() || this.isFF29() || this.isFF30() || this.isFF31() || this.isFF32() || this.isFF33() || this.isFF34() || this.isFF35() || this.isFF36() || this.isFF37() || this.isFF38() || this.isFF39();
-
+        return this.isFF2() || this.isFF3() || this.isFF3_5() || this.isFF3_6() || this.isFF4() || this.isFF5() || this.isFF6() || this.isFF7() || this.isFF8() || this.isFF9() || this.isFF10() || this.isFF11() || this.isFF12() || this.isFF13() || this.isFF14() || this.isFF15() || this.isFF16() || this.isFF17() || this.isFF18() || this.isFF19() || this.isFF20() || this.isFF21() || this.isFF22() || this.isFF23() || this.isFF24() || this.isFF25() || this.isFF26() || this.isFF27() || this.isFF28() || this.isFF29() || this.isFF30() || this.isFF31() || this.isFF32() || this.isFF33() || this.isFF34() || this.isFF35() || this.isFF36() || this.isFF37() || this.isFF38() || this.isFF39() || this.isFF40();
     },
 
     /**
@@ -1167,6 +1174,7 @@ beef.browser = {
             FF37: this.isFF37(), // Firefox 37
             FF38: this.isFF38(), // Firefox 38
             FF39: this.isFF39(), // Firefox 39
+            FF40: this.isFF40(), // Firefox 40
             FF: this.isFF(),   // Firefox any version
 
             IE6: this.isIE6(), // Internet Explorer 6
@@ -1618,6 +1626,10 @@ beef.browser = {
             return '39'
         }
         ;   // Firefox 39
+        if (this.isFF40()) {
+            return '40'
+        }
+        ;   // Firefox 40
 
         if (this.isIE6()) {
             return '6'