Firefox only (Windows/Mac/Linux): Firefox extension JavaScript Options gives you finer-tuned controls on what web site scripts are allowed to do to yo ...

Under JavaScript, select the button: “Do not allow any site to run JavaScript”. Internet Explorer 9, ... but I prefer Firefox because it offers the most options for dealing with JavaScript.

For users who want to disable JavaScript execution globally, for all sites, there's also a checkbox in the extension's options page. uBlock Origin is bound to get a lot of new users with this update.