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Automatically likes videos of channels you're subscribed to
< Commentaires sur YouTube Auto-Liker
Thank you so much for pointing that out. I edited the one I have with the updated script and it works like a charm =D
The update 1.3.27 hasn't been applied here; there is already a corrected version on GitHub.
https://github.com/HatScripts/youtube-auto-liker/blob/master/youtube-auto-liker.user.js