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Commenters seen to love declaring things to be dying, and marketshare trends are only tangentially related. (see e.g. "Netcraft confirms it" meme)

I personally feel like softeare is dead once it is no longer useful, and there is no likelihood of that changing in the foreseeable future. That's obviously not the case woth Firefox.

On the other hand I've seen exaggerated reports of the demise of a project that hasn't had a git commit in the last week, or isn't commercially relevant for whatever the commenter is interested in. Even this doesn't seem to me to be true for Firefox, but I don't think the accusations will stop, or the signal-to-noise will increase.