Just a question: By clicking on a bookmark stored in the bookmark app is it correct that the target will get the IP address of your client but no referrer data (i.e. server URL), thus as if you clicked on a bookmark of your browser?
It’s no proxy, you only store the address but access it directly with your client (so the target host will see your IP address). If you want to hide your IP address, use proxy solution such as TOR.