I haven't used NoScript, but I've used ad blockers before, I'm guessing they work similarly. In that case, NoScript probably gives you the option to select whether to block scripts on a site or not.
So if a site is marked as "Trusted" NoScript may allow scripts on that site to run. Again, I've never used NoScript, so I could be wrong. I'd suggest checking out the documentation on that extension to see if they better explain that feature for you.
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