This is old, but just thought I would say that the dude/dudette has every right to defend themselves after someone does inaccurate reporting and doesn't do their homework. You clearly didn't bother to learn about JSECoin before writing at all. Its a very respectable project for anyone that just bothers to glance at their site.
Second, while it is true that browser mining should ideally be consented to before happening, website owners often find getting over the hump of the newness of this concept is difficult and prefer subtle ways of pointing it out. People are naturally easy to scare away and its hard to get good traffic.
Lastly, browser mining has gotten an unfair reputation as cryptojacking. Sure, wifi hacking methods or other forms of hacking is uncool, but browser mining in itself is a perfectly fine way to monetize the internet. Steem should be doing this! I want steem browser mining to be embedded in my sites, but Monero ain't bad, a lot more money in it at the moment.