Complaining about getting flagged or downvoted makes it likely to be flagged or downvoted, on HN or elsewhere. Your comment doesn't even say anything negative about Firefox, it's just vague complaining.
My most recent post was about the performance of Firefox on MacOS and comparing it to chrome and safari, then also looking at battery life. It was immediately removed.
There's a steady stream of criticism from other users that is not getting flagged (and is often highly upvoted). Consider contacting the mods using the footer link to ask what they think might be different about your comments that results in HN readers flagging them.
Look again, a bunch of the original comments are gone.
Please email the mods using the contact link in the footer and indicate that you think Firefox comments are being unduly flagged for inappropriate reasons. They can see and search all flagged comments, in order to evaluate your concerns. We normal users can't prove the negative you're declaring and your concern of a conspiracy against Firefox criticism is offtopic for this post about a zero-day security issue.
Perhaps it's the way you say it, rather than what you say?
So true. I saw this vulnerability was posted a day ago, and immediately flagged.