Why does my browser indicate that Honey’s extension can “read and change” all my data?

That language is provided by your browser for all browser extensions. What Honey does is much more limited. We read the page when you’re on a shopping website so that we can find coupons for it, and the change we make is to apply coupon codes when you ask us to. We take your privacy very seriously, and you can read more about it in our privacy policy.