| Paste n' Go | | - | | |
| Pentadactyl | | - | | |
| Popup Search Engines | | - | | |
| Print | | - | | |
| Pure Link Text | | - | | |
| QuantumVim | | - | | |
| QuantumVim Extra | | - | | |
| Quick Context 2 | | - | | |
| Quick Context Search | | - | | |
| Quicksearch | | - | | |
| QuoteURLText | | - | | |
| RC Print | | - | | |
| Redirect Link | | - | | |
| ResizeIT | | - | | |
| Restartless Context Search | | - | | |
| Right Encoding | | - | | |
| Right Links | | - | | |
| Right Links WE | | - | | |
| Right-click close | | - | | |
| RightToClick | | - | | |
| Rights To Close | | - | | |
| Rights to Close EX | | - | | |
| SME - Search Made Easy | | - | | |
| Sailor Shortcuts | | - | | |
| Saka Key | | - | | |
| Scroll here | | - | | |
| Scroll to Top／Bottom | | - | | |
| ScrollAnywhere | | - | | |
| Scrollbar Anywhere | | - | | |
| Scrollkey | | - | | |
| ScrollyFox | | - | | |
| Search Amazon.co.jp | | - | | |
| Search By Middle Click | | - | | |
| Search Engine Quick Switcher | | - | | |
| Search On | | - | | |
| Search Selected Shortcuts | | - | | |
| Search Tabs | | - | | |
| Search With Keywords | | - | | |
| Search it up! | | - | | |
| SearchLoad Options | | - | | |
| SearchMenu - Search Faster in Firefox | | - | | |
| Selected Search | | - | | |
| Selected Search Plus | | - | | |
| Selected Text Searcher | | - | | |
| Selection Context Search | | - | | |
| Selection Context Search - mini ＃1 | | - | | |
| Selection Context Search - mini ＃2 | | - | | |
| SelectionSK | | - | | |
| SelectionSK WS | | - | | |
| Send Link from context menu | | - | | |
