I want to add theme to my WebFreer, and also I want to add extensions to it too. Please, how do I do so?
Only the developer has the possibility of adding extensions to the application. You can request for an extension using the Sourceforge product page. You can open a ticket using the URL below. Additionally, this is a great way to talk to the developer as well.
Ticket page: http://sourceforge.net/p/webfreer-portable-ads-free/tickets/?source=navbar