The reason for the new 'dns' permission is to block more advanced advertising mechanism:
https://github.com/gorhill/uBlock/releases/tag/1.25.0

it's alright

Hey, uBO requires new permission, but I won't check what's it's for on the main plugin page in "release notes" section. I'll use the feedback form on the same page and give this plugin 1 star with question what the new permission is for. Me is genius.

Greatly appreciate the work done on this addon. Thank you so much.

Än så länge väldigt effektivt bra skydd allt i ett koncept

Because of new permission: https://www.ghacks.net/2019/11/20/ublock-origin-for-firefox-addresses-new-first-party-tracking-method/

Bellissimo!