Add updated versions of firefox.

Author: jvennix-r7

lib/rex/exploitation/javascriptosdetect.js

@@ -192,7 +192,34 @@ window.os_detect.getVersion = function(){
 		ua_name = clients_ff;
 		// Thanks to developer.mozilla.org "Firefox for developers" series for most
 		// of these.
-		if ('mozConnection' in navigator) {
+		// Release changelogs: http://www.mozilla.org/en-US/firefox/releases/
+		if ('HTMLTimeElement' in window) {
+			ua_version = '22.0'
+		} else if ('createElement' in document &&
+		           document.createElement('main') &&
+		           document.createElement('main').constructor === window['HTMLElement']) {
+			ua_version = '21.0'
+		} else if ('imul' in Math) {
+			ua_version = '20.0'
+		} else if ('HTMLCanvasElement' in window &&
+			                  'toBlob' in HTMLCanvasElement.prototype) {
+			ua_version = '19.0'
+		} else if ('devicePixelRatio' in window) {
+			ua_version = '18.0'
+		} else if ('HTMLIFrameElement' in window &&
+			                 'sandbox' in HTMLIFrameElement.prototype) {
+			ua_version = '17.0'
+		} else if ('CSS2Properties' in window &&
+		                'animation' in CSS2Properties.prototype) {
+			ua_version = '16.0'
+		} else if ('HTMLSourceElement' in window && 
+		                       'media' in HTMLSourceElement.prototype) {
+			ua_version = '15.0'
+		} else if ('mozRequestPointerLock' in document.body) {
+			ua_version = '14.0'
+		} else if ('Map' in window) {
+			ua_version = "13.0"
+		} else if ('mozConnection' in navigator) {
 			ua_version = "12.0";
 		} else if ('mozVibrate' in navigator) {
 			ua_version = "11.0";