The add-on requires the following permissions for it to operate.
View and manage spreadsheets that this application has been installed in. This permission is required so that the add-on can insert a new sheet called 'Google Contacts' into your spreadsheet file. This new sheet will be used to insert/import the Google Contacts required/selected by you. The add-on will not ready data from any other sheet in your file nor will it read from any other spreadsheet files in your drive.
See and download your contacts. This permission is required to read the list of labels in your contact list. This will allow you to download only contacts with a specific label rather than all the contacts in your list. Once the label is selected, contact data related to name, email, company, job title, address, phone, etc., are downloaded and inserted into a Google Spreadsheet. This permission will not allow any modifications to existing contacts or inserting new contacts.
Display and run third-party web content in prompts and sidebars inside Google applications. This permission is required to display the About and Contact Us prompts. The About dialog shows more information about this product. The Contact Us dialog enables customers to contact support or submit suggestions.
Connect to an external service. This permission is required for logs and analysis purposes. It will help to improve the product.