Disable JavaScript from running in Firefox PDF Now, the ability to turn off JavaScript in PDF documents is effortless to get done, though not as straightforward as we would like.

Learn how to enable or disable JavaScript In Edge, Chrome, Firefox and Opera browser on your Windows 11/10 computer. Browsing speed will improve, but you will lose out on functionalities.

Firefox 23 also introduces a new, simplified logo, and the option to turn JavaScript off has been removed from the Options window.