>go to bitaddress.com
>turn off wifi
>generate offline wallet
>erase cache
>turn on wifi
That doesn't mitigate the possibility of an intentionally weak seed being generated in the js. Who knows if there's some sort of deterministic attack that will be carried out in like 2 years or something based on this script. I suppose someone would have found that by now, but I'd much rather just use bitcoin core to generate keypairs.