| SimpleBlock | | - | | |
| Silent Block | | - | | |
| Show／hide passwords | | - | | |
| Show my Password | | - | | |
| Show me the passsword! | | - | | |
| Show Password Field | | - | | |
| Show Password | | - | | |
| ShareMeNot | | - | | |
| Session Keep Alive | | - | | |
| Self-Destructing Cookies | | - | | |
| Self Destructing Cookies | | - | | |
| See my Passwords | | - | | |
| Secure WebRTC | | - | | |
| Secure Sanitizer | | - | | |
| Secure Password Generator | | - | | |
| Secure Login | | - | | |
| SecretAgent | | - | | |
| Search in Private | | - | | |
| Search Engine Security | | - | | |
| ScriptSafe | | - | | |
| ScriptFilter | | - | | |
| Script Blocker Ultimate | | - | | |
| Saved password editor | | - | | |
| Sanitisminau | | - | | |
| Safeguard | | - | | |
| Safe Preview | | - | | |
| Safe | | - | | |
| SSleuth | | - | | |
| SSL Button | | - | | |
| RoboForm Password Manager | | - | | |
| RequestPolicy Continued | | - | | |
| RequestPolicy | | - | | |
| Request Control | | - | | |
| Request Blocker | | - | | |
| Remove cookies button | | - | | |
| Remove Visited Link | | - | | |
| Remove Cookie(s) for Site | | - | | |
| Remove All Cookies | | - | | |
| RememberPass | | - | | |
| Remember Passwords | | - | | |
| Referrer Switch | | - | | |
| Referrer Control | | - | | |
| Referer Control | | - | | |
| RefControl | | - | | |
| RedirectCleaner | | - | | |
| Redirect Remover | | - | | |
| Redirect Control | | - | | |
| Redirect Cleaner | | - | | |
| Random Agent Spoofer | | - | | |
| RPKI Validator | | - | | |