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You're blaming Mozilla for what the Firefox subreddit did, which is not run by Mozilla?

Unless Mozilla takes a similar stance in-accordance to their own guidelines, yeah: https://www.mozilla.org/en-US/about/governance/policies/part...

At the least I expected some public disassociation with the subreddit, and subsequent forks of it.

I see no mention of Reddit on that page.

It seems my assumption was wrong that the subreddit had any kind of official status from Mozilla.