How safe is Metamask?

I am planning to get Metamask because I want to connect it to Gods unchained but the required permissions seem kinda unsafe to me. “Read and change all your data on the websites you visit” seems like a security problem to me in case Metamask gets hacked. But maybe I am just a bit paranoid? I would be really greatful if some of you people who really understand stuff like this could give me an answer.