[FIX] PDF Viewer for Firefox + NoScript

The integrated PDF Viewer broke for local .pdf files that are saved on desktop after the latest NoScript 2.9.5.1 update, here's how you fix it:

1) Type "about:config" in the URL bar and proceed
2) Search for "capability.policy.maonoscript.sites"
3) Double-click on the right side to edit the Value of this key
4) Either at the end or at the start (press END or HOME key on your keyboard), add this: resource://pdf.js/*
---> do not forget to separate it by a space from other values
5) Hit OK and reload the .pdf tab. The PDF Viewer will work again