This extension is a privacy nightmare. "By default, when you begin selecting text, it sends a secure HTTPS request containing the URL of the specific image... The server responds with a list of existing translations and OCR languages that have been done."
That is some pretty sensitive data to keep around. There seems to be some rudimentary thinking around privacy: "no user tokens, no website information, no cookies or analytics" Yet keeping an index of all the image requests from any IP would not pass muster by any GDPR lawyer I have met.
