| RPF-Enabled RequestPolicy | | - | | |
| QuickPasswords | | - | | |
| PwdHash | | - | | |
| Public Fox | | - | | |
| ProfilePassword | | - | | |
| ProCon | | - | | |
| Private Bookmarks | | - | | |
| Privacy Settings | | - | | |
| Privacy Protector Plus | | - | | |
| Privacy Plus | | - | | |
| Privacy Badger | | - | | |
| Priv8 Search | | - | | |
| Priv8 | | - | | |
| Priv3+ | | - | | |
| Presentation Mode | | - | | |
| Precise Clear History | | - | | |
| PopUp LogOut | | - | | |
| Policy Control | | - | | |
| Policeman | | - | | |
| Perspectives | | - | | |
| Permit Cookies 2 | | - | | |
| Permit Cookies | | - | | |
| Permissions Auto Registerer | | - | | |
| Permission Editer | | - | | |
| PasswordMaker | | - | | |
| Password Tags | | - | | |
| Password Reuse Visualizer | | - | | |
| Password Maker X | | - | | |
| Password Hasher | | - | | |
| Password Generator | | - | | |
| Password Field | | - | | |
| Password Exporter 2012 | | - | | |
| Password Exporter | | - | | |
| Password Engine | | - | | |
| Password Categories | | - | | |
| Password Analyzer | | - | | |
| Passphrase Generator | | - | | |
| Pasa password generator | | - | | |
| Open preset URL in Private Browsing window | | - | | |
| ObPwd Extension | | - | | |
| Norwell | | - | | |
| NoScript Suite Lite | | - | | |
| NoScript | | - | | |
| No-Javascript Addon | | - | | |
| No cross-domain referer | | - | | |
| No Resource URI Leak | | - | | |
| NewHostNotification | | - | | |
| NO Google Analytics | | - | | |
| Multi-Account Containers | | - | | |
| Mozilla Labs： Prospector - about：trackers | | - | | |