Eye Dropper had never collected and will never collect any personal data, browsing history etc.
In future Eye Dropper may collect your picked color history and extension settings (except any data which can help identify user). Such data may be used for decisions about implementing or removing features and getting some usefull/fun facts about picked colors. It will happen only with your permission.
Eye Dropper uses Chrome(Chromium) or WebExtensions Storage Sync API and Web Storage API(localStorage) for storing user's settings and color history.
Donations are processed by Open Collective and payment processors chosen by that organization(currently Stripe and PayPal).