| Compose Mail Button ＜＜ | | - | | |
| Context Highlight | | - | | |
| Context Style Switcher | | - | | |
| Controle de Scripts | | - | | |
| Cookie Notification Preventer | | - | | |
| Crossbrowser | | - | | |
| Custom Page Zoom | | - | | |
| Custom Style Script | | - | | |
| Dark Backgrounds Switcher | | - | | |
| Dark Mode | | - | | |
| Dark Reader | | - | | |
| Darker Background Brighter Font | | - | | |
| Default Zoom | | - | | |
| DelaySites | | - | | |
| Developer Stylesheet Toggler | | - | | |
| Dimmer | | - | | |
| Disable Anti-Adblock | | - | | |
| Disable CSS | | - | | |
| Disable Style Button | | - | | |
| Distractus | | - | | |
| Document Font Toggle | | - | | |
| Dr. Body Narrow | | - | | |
| Dublin Core Viewer | | - | | |
| Dynamic Zoom | | - | | |
| EZ Show | | - | | |
| Easy Image Blocker | | - | | |
| Easy Read | | - | | |
| Element Hiding Helper for Adblock Plus | | - | | |
| Enlight | | - | | |
| Enter elements | | - | | |
| ErrorZilla Mod | | - | | |
| ErrorZilla Plus | | - | | |
| Ez Reader | | - | | |
| Favicon Google icons | | - | | |
| Fierr | | - | | |
| Find and replace | | - | | |
| Find in Page with Preview | | - | | |
| Fire IE | | - | | |
| FixScroll | | - | | |
| Fixed Zoom | | - | | |
| Flash Game Maximizer | | - | | |
| Flash Killer | | - | | |
| FlashResizer | | - | | |
| Flashblock | | - | | |
| Focus Indicator | | - | | |
| Font Changer | | - | | |
| Font Contrast | | - | | |
| Font Replacer | | - | | |
| Footnotify | | - | | |
| FoxLingo | | - | | |
