Fix include reference.

modules/exploits/multi/browser/firefox_xpi_bootstrapped_addon.rb

@@ -12,7 +12,7 @@ class Metasploit3 < Msf::Exploit::Remote
 
   include Msf::Exploit::Remote::HttpServer::HTML
   include Msf::Exploit::EXE
-  include Msf::Exploit::Remote::Browser::FirefoxAddonGenerator
+  include Msf::Exploit::Remote::FirefoxAddonGenerator
 
   def initialize( info = {} )
     super( update_info( info,
@@ -63,7 +63,6 @@ class Metasploit3 < Msf::Exploit::Remote
       return
     end
 
-
     print_status("Sending xpi and waiting for user to click 'accept'...")
     send_response( cli, generate_addon_xpi.pack, { 'Content-Type' => 'application/x-xpinstall' } )
     handler( cli )