The update to the NoScript plugin for Firefox Quantum ( version 57+ ) has a startling regression in that by Default it permits all scripts, objects, media, frames., fonts and WebGL to run for each domain by default.

To disable this, open NoScript Options and scroll to the bottom. Click 'Debug' and a text area will open. Now remove all capabilities listed within the array for Default so that it appears like this:

"DEFAULT": {
    "capabilities": [],
   "temp": false
    },

Then restart the browser.