It was 52 OF 52, 100% of them. That's what makes it significant. Literally not a single dissenting voice. is 52 definitive? No, but that early it's unusual that 100% said no.

I'm fairly sure the 52 are comments to their announcement and not beta testers. There may be some overlap but not enough data to say 100%

If they are purely random, it's damning. Flip a coin until you get heads 52 times in a row.

I can't imagine a quality random sample could come from 52 users who self-selected to participate in a browser beta, then self-selected to post about it in a thread on the Mozilla Connect forum.

The reactions to Firefox's AI features likely range from moderately positive to extremely negative. People who feel moderately about something don't usually bother posting. It doesn't matter how many people feel that way.