Disallowing specific JavaScript functions

[wwj]

Hey there!

I use NoScript and I like it a lot. It would be great if it allowed blocking selected JavaScript functions, because some pose a serious threat to privacy (such as those reading your screen resolution) by fingerprinting. How about that?

Thanks!
wwj

[Giorgio Maone]

You can use script surrogates for this purpose.
E.g., to always return random screen resolution values,

Code: Select all

["screenWidth", "screenHeight"].forEach(function(p) { window.__defineGetter__(p, function() { return Math.round(800 * Math.random()) + 800 }) })

[wwj]

Wow, that is great, thanks! But still, I think it'd be nice to have an easy-to-use interface that would make doing this simple.

[tlu]

You might want to try Controle de Scripts. Its comprehensive help site can be found here.

[wwj]

That's all great, thanks a lot guys, but I guess the best defense against fingerprinting would be the same NoScript assumes -- whitelisting by default, so one'd have to block all JS, and then enable specific functions, and unfortunately neither provide this ability. Do you have any other ideas?

Thanks!
wwj