| Remove／Crop-to Selection | | - | | |
| Remove It Permanently | | - | | |
| Remarkerbe | | - | | |
| ReloadEvery | | - | | |
| RefreshBlocker | | - | | |
| Refresh Blocker | | - | | |
| Reader | | - | | |
| Readable | | - | | |
| Readability | | - | | |
| Read Easily | | - | | |
| QuickPageZoom2 | | - | | |
| Quick Viewers | | - | | |
| Quick Accept-Language Switcher | | - | | |
| Prostetnic Highlighter | | - | | |
| Power Twitter | | - | | |
| PopupButton | | - | | |
| Popup Blocker Ultimate | | - | | |
| Popup ALT Attributes | | - | | |
| Pop-up Controller | [Fx_MinVer] | - | [Fx_MaxVer] | [Japanese] |
| Phrase Highlighter | | - | | |
| Persistent Highlighter | | - | | |
| Permarker | | - | | |
| Passive Cache | | - | | |
| Paragrasp | | - | | |
| Pan | | - | | |
| Page Zoom Buttons | | - | | |
| Page Shadow | | - | | |
| Page Mark | | - | | |
| Page Dark | | - | | |
| Page Colors ＆ Fonts Buttons | | - | | |
| Owl - For comfortable reading | | - | | |
| Open in Reader View | | - | | |
| Open in IE | | - | | |
| Open With Microsoft Edge | | - | | |
| Open With Internet Explorer | | - | | |
| Open With IE + Edge | | - | | |
| Open With | | - | | |
| Open Sans Everywhere | | - | | |
| Open In Chrome | | - | | |
| Nyanize Extension | | - | | |
| Nyan Cat Cursor | | - | | |
| Nuke Anything Enhanced | | - | | |
| NoSquint Plus | | - | | |
| NoComment! | | - | | |
| No Squint | | - | | |
| No Small Text | | - | | |
| Night Mode Pro | | - | | |
| Night Mode Page Dim | | - | | |
| Neon Highlighter | | - | | |
| NO Twitter | | - | | |