Why? If you are so concerned about your anonymity and safety so you don't want to bookmark the SR url why don't you save it on some encrypted media like a usb or SD card? then when your computer is not in use to can remove the evidence. I am well aware there will still be some traces of tor and the storage media but without it they don't have fuck all, sorry I lost it! it broke so I threw it away, whatever they cannot make you produce it, you are only fucked if they find it and you refuse to hand over the encryption key.