isthereanydeal.com é seguro?

Have started stealing steam keys through their "chrome right click context menu" option to "authorize this code to your steam account" or whatever it says. It doesn't... it sends it so someone elses account and then if you try again it tells you the code has just be used to someone elses account and the ITAD website refuses to do anything about it and Steam and Humble Bundle say they can't do anything about it either, though both did recommend not using any 3rd party webplugins with Steam. Makes since after the latest GOG scam of letting 3rd party people write the code that culls your game list from Steam to import to the GOG launcher, but MAKES you actually type in your steam name AND PASSWORD ON AN INSECURE WEBPAGE which I understand is against Steam TOS to begin with.