This only opens up a dark browser for google, Facebook, or Twitter. But the thing to consider is that you then enter user names/passwords into this strange, dark, browser which also has Chinese writing around it. I just dont trust it as it might just be a way for this app to capture your passwords. Plus the whole point of the app which is to reduce blue light on all screens doesnt even work.
Gtnator50 about Blue Light 0 Browser