I don't know about other people but I find it hard to trust browser extensions. After all the news about hacking though the browser extension, its never going to be easy to trust one, I'd rather go for an off line wallet. Though I'm not fan of Cryptokitties, it still involve money. They are costly to invest with. They may look cute but seem no use case
Is there?It is an investment.You can sell it at some point, or breed adn sell the new kitty you just made.
I've used guarda wallet and it's pretty safe. I don't think that the wallet is in the browser, it just helps to access blockchain from it