We understand that it may sound a little disturbing that Mate requests access to your browser history and webpage contents in Safari (and all other browsers, too, actually).
In the reality there's nothing dangerous about it. We utterly need this permission to provide you with on-page translations – one of the Mate's major features. Without it, we can't inject our translation scripts to pages. We don't collect any data. We don't invade your privacy.
Actually, we have all sorts of privacy details in our Privacy Policy. It's a good one. We encourage you to read it! We bet you don't come across such well-written and user-friendly policies on the internet very often.