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How can I restrict access to social network sites?


We received a win.35 blaster worm in our system we use for work. Firefox is our browser and thunderbird is our email. The tech who fixed our system , hundreds of dollars later, believes the cause is from someone accessing a social network site such as facebook, etc. I want to be able to change a setting that will not allow access. How to do this.

Additional System Details

Sites Affected


Installed Plug-ins

  • Office Plugin for Netscape Navigator
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Coupons, Inc. Coupon Printer DLL
  • Coupons, Inc. Coupon Printer Plugin
  • Adobe PDF Plug-In For Firefox and Netscape "9.4.5"
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • RealJukebox Netscape Plugin
  • Shockwave Flash 10.3 r183
  • Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
  • 4.0.60531.0
  • Motive Plugin for Mozilla Browsers
  • RealPlayer(tm) HTML5VideoShim Plug-In
  • RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
  • npsdcwc.dll


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.1) Gecko/20100101 Firefox/6.0.1

More Information

  • Top 10 Contributor
  • Moderator
10781 solutions 97024 answers


Remember that it is an extension and staring in Safe mode or disabling that extension in Tools > Add-ons > Extensions and restarting Firefox is sufficient to bypass that block.

Best would be to block such sites in a firewall or proxy.

Modified by cor-el