I know basically what a VPN is from work, but saw this and am wondering whether it's worth it and exactly what it accomplishes. Buy VPN | Private Internet Access VPN Service First, does it really accomplish anything other than blocking tracking etc? Would like to know if all my present Firefox security add-ons are still necessary, such as NoScript, Better Privacy, the various Ad Blockers, etc, and the no-tracking things like Ghostery, Google Privacy, DoNotTrackMe, etc. I like the protection but those apps can slow things down, and having to temporarily allow this or that also gets frustrating over time. And are the anti virus and malware apps still needed? Last, I'd like to keep XP but with MS not supporting it any longer, was wondering if a VPN like the above would help in any way to lessen the dangers. Thanks!