It should be noted that the NoScript add-on for Firefox prevents this from working through it's Clickjacking-protection (and possibly a couple of more, cursor-specific tricks). People need to know that it does more than block JavaScript.
And, even in the mode where JavaScript is allowed by default on new sites, the other protections (Clickjacking, XSS, ABE, etc) still apply.
Many people (including myself) would swear by leaving the cookie notification on and confirming every. single. one. of. them.
That has long stopped being feasible and I assume it will be the same with NoScript in a few years.