Hi PH! Librarian is a Chrome Extension that allows anyone to comment on any arXiv paper as well as get the Bibtex of the paper and links to its references. The place where a lot of scientists post their most recent findings before publishing on Journals should also be a place where open discussions around papers take place. Papers are usually dense and hard to read and there's so much information that can be added to a paper to make it more accessible: further explanations, data, presentations, videos, code etc. We think this is an important step towards open science and public collaboration/discussion about papers. We wrote a blogpost about what led us to build this: https://medium.com/@fermatslibra... Any feedback is welcomed :)