| Script Blocker Ultimate | | - | | |
| ScriptFilter | | - | | |
| ScriptSafe | | - | | |
| Search Engine Security | | - | | |
| Search in Private | | - | | |
| SecretAgent | | - | | |
| Secure Login | | - | | |
| Secure Password Generator | | - | | |
| Secure Sanitizer | | - | | |
| Secure WebRTC | | - | | |
| See my Passwords | | - | | |
| Self Destructing Cookies | | - | | |
| Self-Destructing Cookies | | - | | |
| Session Keep Alive | | - | | |
| ShareMeNot | | - | | |
| Show Password | | - | | |
| Show Password Field | | - | | |
| Show me the passsword! | | - | | |
| Show my Password | | - | | |
| Show／hide passwords | | - | | |
| Silent Block | | - | | |
| SimpleBlock | | - | | |
| Smart Referer | | - | | |
| Snap HTTP Padlocks | | - | | |
| Social Disconnect Plus | | - | | |
| Speaker privacy | | - | | |
| StartupMaster | | - | | |
| Statutory | | - | | |
| Stop Fingerprinting | | - | | |
| Taborama | | - | | |
| Targeted Advertising Cookie Opt-Out | | - | | |
| TeaBiscuit | | - | | |
| Toggle Cookies | | - | | |
| Toggle Referer | | - | | |
| TrackMeNot | | - | | |
| TrafficLight | | - | | |
| TrustAuth | | - | | |
| URL Security | | - | | |
| Unhide Passwords | | - | | |
| UniquePasswordBuilder Addon | | - | | |
| UserCSP | | - | | |
| View Cookies | | - | | |
| View Your Certificates Email Address | | - | | |
| Visual Hashing | | - | | |
| Visualize Old Passwords | | - | | |
| Web Storage Viewer | | - | | |
| WebAPI Manager | | - | | |
| WebFilter Pro - The safe browsing addon! | | - | | |
| WebMasterkey | | - | | |
| WebRTC Control | | - | | |
