diff --git a/core/main/client/browser.js b/core/main/client/browser.js
index 8c286ef18..27f7e9594 100644
--- a/core/main/client/browser.js
+++ b/core/main/client/browser.js
@@ -405,12 +405,20 @@ 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\/38./) != null;
     },
 
+    /**
+     * Returns true if FF39
+     * @example: beef.browser.isFF39()
+     */
+    isFF39: 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\/39./) != 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();
+        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();
 
     },
 
@@ -1149,6 +1157,7 @@ beef.browser = {
             FF36: this.isFF36(), // Firefox 36
             FF37: this.isFF37(), // Firefox 37
             FF38: this.isFF38(), // Firefox 38
+            FF39: this.isFF39(), // Firefox 39
             FF: this.isFF(),   // Firefox any version
 
             IE6: this.isIE6(), // Internet Explorer 6
@@ -1592,6 +1601,10 @@ beef.browser = {
             return '38'
         }
         ;   // Firefox 38
+        if (this.isFF39()) {
+            return '39'
+        }
+        ;   // Firefox 39
 
         if (this.isIE6()) {
             return '6'