in my moto g missing almost 2 gb of storage.
app + pictures + video + audio + other+cache = 2.60
but the space used is 4.28 !!
Can I have that screenshot of your moto g(3nd) 16gb?
Mercury Browser is the best
But:
Don't save the passwords. Disquis login don't work in websites. In privacy mode when go back in normal mode, Mercury lost normals cookies, preferences are ok.