Anyone will get this message sooner or later so the normal steps I usually do are: Check if I have read/execute permissions on the file Check if it is blocked because it is an internet download and then unblock it Check if I'm the owner Well today...
Firefox is my default browser and the add-ons make it even more powerful then it already is. I thought that it would be nice to share which extensions I'm using: NoScript - Easily enable java/javascript/flash per domain. Adblock Plus - Hide those...