At userscripts.org :
Why the same name?, Are they the same script?
It's a 'hack' attempt that seems to try and trace your footsteps . The scripts are definitely not the same.
Just follow Timbones' links in this thread and you should be OK. Better to use Chrome & the Chrome store,.
With other scripts by the same author named 'How can hack facebook fan page' even the most gullible person would likely think twice before installing this.
Is there any way to report blatant hacks of scripts on userscripts.org? Doubt it, but I was not signed in when I checked it on my mobile.
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