[puttycat]

News Feed Eradicator is open source: https://github.com/jordwest/news-feed-eradicator/

(and indeed great)

[zukerpie]

Do you know about some way to check whether what I install from Extension Store is exactly the same as on Github?

[quotz]

I think you could use the source code on Github and compile it and install it manually yourself on a browser