diff --git a/drivers/firefox/content/js/content.js b/drivers/firefox/content/js/content.js
index 57b315d01..bf38376d4 100644
--- a/drivers/firefox/content/js/content.js
+++ b/drivers/firefox/content/js/content.js
@@ -1,3 +1,5 @@
+"use strict";
+
 (function() {
 	addEventListener('DOMContentLoaded', onLoad, false);
 
diff --git a/drivers/firefox/content/js/driver.js b/drivers/firefox/content/js/driver.js
index e1906c960..554dbf8ea 100644
--- a/drivers/firefox/content/js/driver.js
+++ b/drivers/firefox/content/js/driver.js
@@ -3,6 +3,8 @@
  */
 
 (function() {
+	//'use strict';
+
 	if ( wappalyzer == null ) return;
 
 	var w = wappalyzer;
@@ -250,7 +252,7 @@
 
 		w.analyze(msg.json.hostname, msg.json.url, { html: msg.json.html, env: msg.json.env });
 
-		delete msg;
+		msg = null;
 	}
 
 	/**
diff --git a/drivers/firefox/install.rdf b/drivers/firefox/install.rdf
index 0e49df98c..932353135 100644
--- a/drivers/firefox/install.rdf
+++ b/drivers/firefox/install.rdf
@@ -3,7 +3,7 @@
 <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#">
 	<Description about="urn:mozilla:install-manifest">
 		<em:id>wappalyzer@crunchlabz.com</em:id>
-		<em:version>2.2.0</em:version>
+		<em:version>2.2.1</em:version>
 		<em:type>2</em:type>
 		<em:unpack>true</em:unpack>
 
diff --git a/drivers/firefox/locale/fr-FR/wappalyzer.properties b/drivers/firefox/locale/fr-FR/wappalyzer.properties
index d49f1c261..b04d1823e 100644
--- a/drivers/firefox/locale/fr-FR/wappalyzer.properties
+++ b/drivers/firefox/locale/fr-FR/wappalyzer.properties
@@ -1,15 +1,15 @@
 wappalyzer.name           = Wappalyzer
 wappalyzer.noAppsDetected = Pas d'applications détectées
 
-wappalyzer.cat1	          = CMS
-wappalyzer.cat2	          = Forum
-wappalyzer.cat3	          = Gestionnaire de base de données
-wappalyzer.cat4	          = Outil de documentation
-wappalyzer.cat5	          = Widget
-wappalyzer.cat6	          = Boutique en ligne
-wappalyzer.cat7	          = Galerie photo
-wappalyzer.cat8	          = Wiki
-wappalyzer.cat9	          = Gestionnaires de serveur
+wappalyzer.cat1           = CMS
+wappalyzer.cat2           = Forum
+wappalyzer.cat3           = Gestionnaire de base de données
+wappalyzer.cat4           = Outil de documentation
+wappalyzer.cat5           = Widget
+wappalyzer.cat6           = Boutique en ligne
+wappalyzer.cat7           = Galerie photo
+wappalyzer.cat8           = Wiki
+wappalyzer.cat9           = Gestionnaires de serveur
 wappalyzer.cat10          = Outil de statistiques
 wappalyzer.cat11          = Blog
 wappalyzer.cat12          = Framework JavaScript
diff --git a/drivers/firefox/locale/nl-NL/wappalyzer.properties b/drivers/firefox/locale/nl-NL/wappalyzer.properties
index dd7745037..3aecb9e53 100755
--- a/drivers/firefox/locale/nl-NL/wappalyzer.properties
+++ b/drivers/firefox/locale/nl-NL/wappalyzer.properties
@@ -1,15 +1,15 @@
 wappalyzer.name           = Wappalyzer
 wappalyzer.noAppsDetected = Geen applications gedetecteerd 
 
-wappalyzer.cat1	          = CMS
-wappalyzer.cat2	          = Forum
-wappalyzer.cat3	          = Database Manager
-wappalyzer.cat4	          = Documentatie Tool
-wappalyzer.cat5	          = Widget
-wappalyzer.cat6	          = Web Winkel
-wappalyzer.cat7	          = Photo Gallerij
-wappalyzer.cat8	          = Wiki
-wappalyzer.cat9	          = Hosting Paneel
+wappalyzer.cat1           = CMS
+wappalyzer.cat2           = Forum
+wappalyzer.cat3           = Database Manager
+wappalyzer.cat4           = Documentatie Tool
+wappalyzer.cat5           = Widget
+wappalyzer.cat6           = Web Winkel
+wappalyzer.cat7           = Photo Gallerij
+wappalyzer.cat8           = Wiki
+wappalyzer.cat9           = Hosting Paneel
 wappalyzer.cat10          = Analytics
 wappalyzer.cat11          = Blog
 wappalyzer.cat12          = JavaScript Framework
diff --git a/share/images/icons/Percussion.png b/share/images/icons/Percussion.png
new file mode 100644
index 000000000..e240fe781
Binary files /dev/null and b/share/images/icons/Percussion.png differ
diff --git a/share/js/apps.js b/share/js/apps.js
index 13f14cfcd..8f299da7d 100644
--- a/share/js/apps.js
+++ b/share/js/apps.js
@@ -1,4 +1,6 @@
 (function() {
+	//'use strict';
+
 	if ( wappalyzer == null ) return;
 
 	var w = wappalyzer;
@@ -212,7 +214,6 @@
 		'MooTools':                         { cats: [ 12 ], script: /mootools.*\.js/, env: /^MooTools$/ },
 		'Movable Type':                     { cats: [  1 ], meta: { 'generator': /Movable Type/i } },
 		'Mustache':                         { cats: [ 12 ], env: /^Mustache$/ },
-		'Hiawatha':                         { cats: [ 22 ], headers: { 'Server': /Hiawatha/i } },
 		'MyBB':                             { cats: [  2 ], html: /(<script [^>]+\s+<!--\s+lang\.no_new_posts|<a[^>]* title=("|')Powered By MyBB)/i, env: /^MyBB/ },
 		'MyBlogLog':                        { cats: [  5 ], script: /pub\.mybloglog\.com/i },
 		'Mynetcap':                         { cats: [  1 ], meta: { 'generator': /Mynetcap/i } },
@@ -236,6 +237,7 @@
 		'PANSITE':                          { cats: [  1 ], meta: { 'generator': /PANSITE/i } },
 		'papaya CMS':                       { cats: [  1 ], html: /<link[^>]*\/papaya-themes\//i },
 		'Parse.ly':                         { cats: [ 10 ], env: /^PARSELY$/ },
+		'Percussion':                       { cats: [  1 ], meta: { 'generator': /(Percussion|Rhythmyx)/i }, html: /<[^>]+class="perc-region/ },
 		'Perl':                             { cats: [ 27 ] },
 		'PHP':                              { cats: [ 27 ], headers: { 'Server': /php/i, 'X-Powered-By': /php/i, 'Set-Cookie': /PHPSESSID/ }, url: /\.php$/ },
 		'Phpcms':                           { cats: [  1 ], env: /^phpcms/ },
diff --git a/share/js/wappalyzer.js b/share/js/wappalyzer.js
index 1e744471f..b9b601cff 100644
--- a/share/js/wappalyzer.js
+++ b/share/js/wappalyzer.js
@@ -7,6 +7,8 @@
  */
 
 var wappalyzer = wappalyzer || (function() {
+	//'use strict';
+
 	/**
 	 * Call driver functions
 	 */
@@ -130,7 +132,8 @@ var wappalyzer = wappalyzer || (function() {
 
 								var
 									regex = /<meta[^>]+>/ig,
-									match = []
+									match = [],
+									meta
 									;
 
 								while ( match = regex.exec(data['html']) ) {
@@ -177,6 +180,8 @@ var wappalyzer = wappalyzer || (function() {
 				}
 
 				// Implied applications
+				var i, j, k;
+
 				for ( i = 0; i < 3; i ++ ) {
 					for ( j in apps ) {
 						if ( w.apps[apps[j]] && w.apps[apps[j]].implies ) {
@@ -222,7 +227,8 @@ var wappalyzer = wappalyzer || (function() {
 					if ( w.detected[url].indexOf(app) === -1 ) w.detected[url].push(app);
 				});
 
-				delete apps, data;
+				apps = null;
+				data = null;
 			}
 
 			driver('displayApps');