Hi, I'm developing Firefox extensions for the last 7 years. The project is simple, but quite time-consuming. It will take some amount of time to make it really convenient.
My idea is to give the extension an ability to configure parent folder only. The extension will stan all subfolders and build appropriate menu item with submenus. In this case you'll need to create correct folders on your PC. No need to enter them again into FF extension settings.
May be sure, if you choose me, you'll get top quality result.
Thank you, Viktar.