Interesting. The paywall killer reset the number of free articles I could read on NYT to five, getting around the paywell that initially blocked me.
Works for FT too. Used to work for the WSJ too until last week they went to a hard paywall from soft.
Works for bloomberg, wired.com...
What can you do with it?
All of these are JavaScript, so it doesn't hack anyone's computer, it only modifies what has been done to yours.
Likewise, the FormHacker works only if they don't have server-side validation!