Access your data for all websiteshttps://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites
The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords.
Extensions requesting this permission might:
Read product and price information from a page to help find you the best price on items you're shopping for
Offer a password manager that reads and writes details of your username and password
Provide an ad blocker by reading the content of each web page you open to find and remove ad code
Maybe the permission model doesn’t allow finer control.Probably that is the reason for seeing this almost everywhere, but what could be the reason for that Mozilla cannot offer a better permission model...