Muvic Sync Helper is a companion to muvic.app. When the user clicks "Run sync" on muvic.app, the extension reads the user's existing Beatport and Bandcamp session cookies (host permissions are scoped to beatport.com and bandcamp.com only) and hands them to muvic.app to add tracks to the user's cart/wishlist on their behalf. It does not read other sites, run in the background, or use telemetry. The declared data_collection_permissions (authenticationInfo) reflects this cookie handoff.

Fully exercising the extension requires a muvic.app account and being signed in to Beatport/Bandcamp. I'm happy to provide a test account on request.