As I understand it, the blocker has website-specific rules to automatically click the right buttons. For the first release, they've probably primarily tested those with German websites. I assume that if it works well there and they've ironed out most bugs, we can see it roll out more widely.
We can do that when it's actually released; blogspam tries to publish on the expected release date before the actual release so it can scoop up the clicks. Release notes should be posted here later: https://www.mozilla.org/firefox/120.0/releasenotes/
Mozilla Firefox 120 Is Now Available for Download, Here's What's New (9to5linux.com)