If you want to disable JavaScript from running in Mozilla Firefox, then you need to change this hidden setting. JavaScript can be a security risk!

Firefox 23 lands with a new logo and mixed content blocking But the much-valued option to disable JavaScript has been hidden.

Finally, Firefox 23 removes the option to disable JavaScript from the Options pane -- and if you had JavaScript turned off, it has been turned back on.

Mozilla recommended users disable JavaScript in Firefox if they were unable to immediately patch the browser.