I don't really disagree, but to play devil's advocate a little, if I was giving away free knives and someone cut themselves, would I be to blame in any way?
The company would be knowingly made of lead but neither owners or buyers would be informed of that by the company who is themselves heavily invested in lead.
i didn't recall chrome being marketed as a safer alternative. I suppose the original "sandbox" tab is considered safer, but not in the way that this chrome extension is dangerous in.
And why does it being a monopoly matter in this context? Not to mention that it isn't a monopoly.