for a .php file on facebook.com in Firefox while browsing these forums. Occasionally, off and on, but only at home, never at work. Nothing the last few weeks. Yesterday it suddenly was at every page. Very, very annoying.
The workaround for me in Firefox: ABP (Adblock Plus) found it as blockable (something like static.ak.connect.facebook.com). So I blocked that and it was gone immediately.
I'm not a member of facebook, and I've never shown any interest in loading their features.
It was fine a couple of days ago & suddenly it's showing this on & off.
What the heck happened??