Those new chrome extensions that show YouTube dislikes, how do they actually find the dislikes for each video?

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Title says the most of it. I’ve been trying some browser extensions that allow me to see specifically how many dislikes are on videos, when I technically shouldn’t be able to. How do these extensions do this? I was sure that YouTube would at least put a little more effort into hiding them, if they cared as much as they made out.

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