Using correct function to get extension datas directory name

Author: DGuerra

lib/Firefox/FirefoxProfile.php

@@ -61,7 +61,7 @@ public function addExtensionDatas($extension_datas) {
       return;
     }
 
-    $this->extensions_datas[dirname($extension_datas)] = $extension_datas;
+    $this->extensions_datas[basename($extension_datas)] = $extension_datas;
     return $this;
   }