JavaScript is a big part of most modern websites, but it has its share of cons. Here's how to disable it.

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.

To disable JavaScript in Firefox, you'll have to install a third-party add-on or use the configuration editor. For that, type about:config in the address field and accept the risk to continue.

Luckily, it's pretty simple to turn it on, and there are ways to just disable JavaScript on certain sites. Here's how to enable JavaScript in Chrome on Windows 10.