Full policy: https://everregistry.com.au/privacy (see section 8, "Browser extension")

Summary: the extension reads a page only when you click it, to extract the product's title, image and price. It uses your existing everregistry.com.au sign-in and talks only to EverRegistry's own servers. Locally it stores your session token, a short-lived cache of your registries, and unsaved form drafts. No tracking, no analytics, no third-party data sharing, and it never reads pages in the background.