Disable facebook login popup.
I don't use facebook. However, occasionally I need to look at a company's facebook page for one reason or the next. Usually product releases or information. I furiously hate facebook and everything they stand for, and one of the reasons for that is illustrated by the obnoxious prompt for login/join when you aren't signed into facebook and are looking at a page.
Well, I found a way to stop it, and stop them.
Install ublock origin popup blocker on firefox or chrome... and add a custom filter. Simple and clean.
! Remove Facebook Log In / Sign Up banner facebook.com###pagelet_growth_expanding_cta facebook.com###u_0_6