Preventing Tracking Prevention Tracking
Some of the people I've talked with over the years study things like nuclear weapons arms control or cyberwarfare. The most paranoid of the bunch have resorted to having Virtual Private Servers screen shot websites with headless browsers once it loads and pipe it back to their research machine. I can't remember if it's a table of PNGs or just one big one, but either way it's sent back over a SSH tunnel and when you click the server knows what you're trying to click on and preforms the action for you, and will randomly forward the click to a new VPS.<p>It's not perfect because the IP blocks make it obvious that it comes from DigitalOcean, AWS, etc, but it's sure better than loading untrusted PDFs or JS locally. Still vulnerable to a network attack, though.