We use Google API's to access some of the data of those Google services. Data from Google services is accessed directly within the add-on and is never sent to an external server. Some of this data is cached locally to provide a better user experience.
Permissions for Google API's are optional and can be revoked in the settings page of the add-on under "granted permissions". Or by going to https://myaccount.google.com/permissions
Cached data and user preferences are stored within the browser and, if enabled, synced across devices using Firefox sync. This data can be removed at any time in the settings page of the add-on under "Reset settings".
Our website https://apps.jeurissen.co is opened after installation and can be accessed after major updates. No personal information is shared except the visitors IP-address which is needed to protect against DDOS-attacks. This data is removed within a week.