Re: This is a great example of online companies using third party plug-ins
"... send recursively calls itself every 30 milliseconds (!). They really don’t care about performance. ..." [https://blog.jse.li/posts/marveloptics-malware/] cute
No damn wonder that my Javascript enabled browsers (Firefox, Opera) are prone to lock up occasionally if I browse beyond the Reg, Wikipedia, Phys.org -- despite my blocking most advertisers in the hosts file in a token attempt at self-defense.
It's pretty clear that Javascript (and similar technologies) must die. They are simply way too capable for end user safety. The issue should be how to get rid of them in an orderly fashion not whether they can/should be tolerated.