It was a fork. I'm not sure what you mean exactly by "unofficial". Gorhill said at the time that he didn't have time to maintain a Safari version, but he was aw

It was a fork. I'm not sure what you mean exactly by "unofficial". Gorhill said at the time that he didn't have time to maintain a Safari version, but he was aware of the fork, which mostly shared code with upstream, and seemingly endorsed the fork. https://github.com/gorhill/uBlock/wiki/About-Safari-and-Canary-support https://github.com/gorhill/uBlock/wiki/About-Safari-and-Cana...