| Change Panorama Shortcut | | - | | |
| Change Search Shortcut | | - | | |
| Clear inputs | | - | | |
| ClearFileUploadFields | | - | | |
| Click Modifiers | | - | | |
| ClickCutter AutoCopy | | - | | |
| ClickLater | | - | | |
| Clickback | | - | | |
| Clickless Menu | | - | | |
| Clip Reference | | - | | |
| Clone Window | | - | | |
| Close Other Tabs Shortcuts | | - | | |
| Close Tabs Shortcuts | | - | | |
| CloseTab | | - | | |
| ClumsyFingers | | - | | |
| Come back “Block image from ad.sites” | | - | | |
| CompassMenu | | - | | |
| Context History | | - | | |
| Context Peek | | - | | |
| Context Search (840902) | | - | | |
| Context Search 2 | | - | | |
| Context Search Compact | | - | | |
| Context Search RG | | - | | |
| Context Search X | | - | | |
| ContextMenuPlus | | - | | |
| ContextSearch web-ext | | - | | |
| Contextlets | | - | | |
| Copy All Tab Urls WE | | - | | |
| Copy As Plain Text (914288) | | - | | |
| Copy As Plain Text | | - | | |
| Copy As Text | | - | | |
| Copy Current Page URL with Anchor | | - | | |
| Copy Fixer | | - | | |
| Copy Link Name | | - | | |
| Copy Link Text (WebExtension) | | - | | |
| Copy Link Text | | - | | |
| Copy Link URL | | - | | |
| Copy Link／Tab Name and URL | | - | | |
| Copy On Select | | - | | |
| Copy Page Address (WebExtensions) | | - | | |
| Copy Plain Text - Jetpack | | - | | |
| Copy Plain Text 2 | | - | | |
| Copy PlainText | | - | | |
| Copy PlusPlus | | - | | |
| Copy Selected Links | | - | | |
| Copy Text Link | | - | | |
| Copy Title and URL | | - | | |
| Copy Title | | - | | |
| Copy URL To Clipboard | | - | | |
| Copy URL With Hash | | - | | |
