That’s not a correct interpretation of the permission:
Access your data for sites in the “named” domain
The extension could read the content of web pages you visit in the specified domain, as well as data you enter into those web pages, such as usernames and passwords.
It requires permission to modify said domains to remove the paywall from their articles.
Why does it ask to access MY data in so many sites? According to Firefox, that includes passwords
That’s not a correct interpretation of the permission:
It requires permission to modify said domains to remove the paywall from their articles.