I respect your opinion. However, as someone who protects the privacy in many more practical and sufficient ways, I don't want to click the same cookie warning button on 150 websites daily, nor read privacy policies all day long.
Don't get me wrong: I am all for the privacy protection. I just think displaying a cookie warning everywhere is not a good and practical solution. You don't want to be notified about dangers when crossing the street and asked to agree or sign the document which states all the dangers of it, right? It would be too much, because you already know it, and you don't want to waste time you don't have, right?
The same goes for internet privacy: education is the key - the right kind of education which takes place in the right kind of institutions and not on the websites themselves (for some websites, it's almost like forcing a thief to explain what he's going to steal from you on purpose).
Btw, this extension is created long before the GDPR :)