i personally just let them sit in my paper wallet. i heard about this site called magnr that pays u interest, but be carefull using it. dont put too much.
the hardest part for me is probally the hd multisignature wallets, i mean i get how it generates alot of private keys. but is that an infinite number? cuz there arent infinite private keys in total.
i was having this problem last week , idk what i did but it seems i fixed it somehow by resetting my router. if that still doesnt work try using a different browser.
that doesnt seem like an add on to bitcoin. someone could make something like a messenger where you log in with your adresss and message other addresses, thatd be cool