Authorisations

[WebworkrNet]

The add-on requires the following permissions according to https://addons.mozilla.org/de/addon/checkmarks-web-ext/:

1. Read and modify bookmarks
2. Delete browser history, cookies and related data
3. Access browser tabs
4. Access browser activity during page changes
5. Access your data for various websites

Some permissions are obvious to me from the context, others are not. What are each of these permissions required for?

Thank you