| SimpleFill | | - | | |
| Simple Form History | | - | | |
| Simple Form Fill | | - | | |
| Select like a Boss | | - | | |
| ScribeFire Next | | - | | |
| ScribeFire Classic | | - | | |
| Scrapbook Lite | | - | | |
| ScrapBook+ | | - | | |
| ScrapBook X | | - | | |
| ScrapBook Plus 2 | | - | | |
| ScrapBook | | - | | |
| SaveSel | | - | | |
| SaveAsFilename | | - | | |
| Save Text Area | | - | | |
| Reverse Text | | - | | |
| Reply Robot | | - | | |
| Remove Anything | | - | | |
| Random Select Radio Buttons | | - | | |
| QuickWikiEditor | | - | | |
| Quick Copy 2 | | - | | |
| Print as Plain Text | | - | | |
| PeraPera-kun | | - | | |
| Paste Quote | | - | | |
| Paste Email Plus | | - | | |
| Paste Email | | - | | |
| Password Mask Changer | | - | | |
| Page Hacker Revived | | - | | |
| Page Hacker | | - | | |
| PDF Draw | | - | | |
| NoClick | | - | | |
| MyWords | | - | | |
| Multiple Checkbox Checker | | - | | |
| Multicopy | | - | | |
| MultiCopy | | - | | |
| Modify Response Headers | | - | | |
| Modify Headers | | - | | |
| Markdown Here | | - | | |
| Markdown Editor for Firefox | | - | | |
| MarkDown Editor | | - | | |
| Linkify | | - | | |
| Link Stunner | | - | | |
| Lazarus： Form Recovery | | - | | |
| Kitsune | | - | | |
| Keylogger Beater | | - | | |
| Jot | | - | | |
| It's All Text! | | - | | |
| Invert Input | | - | | |
| Insert Unicode | | - | | |
| Input autofocus | | - | | |
| Input Changer | | - | | |