I totally agree with you @ragetester, but in this case it's only a warning when you're in blacklisted sites. In my case I didn't activate the Ethereum addresses functionality.

But actually everything is dangerous, as any extension, program or add-in, related or not to crypto, may be phishing your info

BTW, I've no relation with this extension and I'm not responsible if anything happends. I just wanted to share something I thought it could be helpful :-s