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.

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.

To disable JavaScript in Adobe Reader or Acrobat on Windows, users must select Preferences from the Edit menu, choose “JavaScript,” then uncheck the “Enable Acrobat JavaScript” option.