When I tried to access facebook, google maps, and some youtube videos I had problems either accessing or viewing the sites in ALL the browsers installed in my computer: Mozilla Firefox, Opera, Safari, Microsoft Internet Explorer.

I tried everything from virus scans to re installing javascript. I even wanted to re format my computer suspecting of a virus, but fortunately I found the solution before doing it.

The problem was caused by my Symantec client firewall. I did the following
Open Symantec Client Firewall>Privacy control> Configure> Custom level> uncheck the “Enable Browser Privacy” > OK > OK

All of the sudden I tried facebook.com and google maps and they loaded just fine. I did not even need to restart my browser. I hope this helps.