The first time the extension requested permission "Access your data for all websites" because there was a transition from the XUL version to the WebExtension. In the XUL version permission was not asked. In WebExtension permissions began to be declared.
Then I added the ability to export profiles to the new version, which can be implemented only through download API, so the following permission was needed - "Download files and read and modify the browser`s download history".
The explanation of these permissions is in Security FAQ:
http://firefoxer.ru/informenter+faq.htm
If there is no question on this list that interests you, then write either here or on the mail: informenter.plus@gmail.com, I will answer.