Works, but very poor UI Rated 2 out of 5 stars

This addon inserts a 'badge' into the webpage when it finds an article, rather than using its toolbar icon.
This is problematic because addons should not modify webpage content unnecessarily. It makes it hard to distinguish between browser chrome and webpage content, which can make phishing easier.
Additionally, though the addon does have a toolbar icon, it does not provide access to the discovered articles and so is useless and simply wastes screen real-estate.

If these issues were fixed this would be a 5-star review!

Rated 4 out of 5 stars

Very good

Use this and Sci-Hub Rated 5 out of 5 stars

Installed this on FireFox & Chrome

Rated 4 out of 5 stars

Go

Rated 5 out of 5 stars

Must Have Add-On for Researchers Rated 5 out of 5 stars

Very good effort to allow access to research using legal means.

Rated 4 out of 5 stars

Rated 4 out of 5 stars

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Perfect! Rated 5 out of 5 stars

Great addon that helps to empower the exchange of knowledge which empowers the world!!

Truly a forward thinking and progressive addon.

Rated 5 out of 5 stars

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Great Rated 5 out of 5 stars

Really helpful to work for papers.. Thanks!

Amazing tool Rated 5 out of 5 stars

Works great with a lot of papers!
Good Work!

Works great on Android Firefox also :D Rated 5 out of 5 stars

Please provide a link on the homepage for Firefox for Android also, not only for desktop Firefox.

Simple things can make a big difference. Rated 5 out of 5 stars

Open Access truly made simple.
This is the best single purpose add-on I really love.
Kudos to Jason and Heather, but also Kudos to all the people worldwide putting the effort in making Open Access happening (making deals, deposit author versions, creating funds, flipping journals, etc. ) Without that combined effort this add-on was not possible.

Important work Rated 5 out of 5 stars

I fully support the idea of Unpaywall and think the way they implemented it is truly awesome.

Available preprint versions are not yet found. At least not for the articles I tried. But maybe that is a good thing...

Awesome Rated 5 out of 5 stars

Works seamless. A very important work.

Best way to find open versions of paywalled journal articles Rated 5 out of 5 stars

I've been using this for the past couple of weeks (initially on Chrome and now on Firefox) and it is simply the single best way out there to quickly find and read legally open versions of paywalled journal articles. The interface is super easy and intuitive and it's now a part of my everyday toolkit.

COI: I volunteer on the Board of Directors for Impactstory, the non-profit that makes this add-on.

Nice one Rated 5 out of 5 stars

Unpaywall does now indeed work on both Firefox and Chrome. Kudos to you.

Bonus points for "for the Open Access nerds: the Unpaywall tab can change colors to indicate Green or Gold OA, too. Enable it in settings."

Great! Rated 5 out of 5 stars

This add-on has helped me find a lot of research papers I needed for my thesis. Please keep up the good work. I am amazed it has been this useful in so little time but I found a solid 90% of the research papers I needed!