i don't think so, it's not really safe to enter your private key on a website. There isn't really anything wrong with the page itself, it's just that the method of creating a wallet and how you use it opens up attack vectors. Etherdelta smart contract is very safe, but as people found out months ago, a DNS hack caused people to get redirected to a fake ED page where any private key they entered was then emptied of funds. You could also get phished by getting linked to a fake site from places like this (misspellings like etherdetla.com are common for this kind of scam) where again, they take your key. Most of those attacks can be prevented if you're really careful with your wallet, but still.

Better to use Metamask or a Ledger Nano S.