| My Keyboard Navigator | | - | | |
| My CopyFixer | | - | | |
| Multilinkus | | - | | |
| Multi Smart Search | | - | | |
| Multi Links Plus | | - | | |
| MozMill | | - | | |
| MoveTabs | | - | | |
| Move Tabs | | - | | |
| Mouseless | | - | | |
| MouseControl | | - | | |
| Mouse Statistics | | - | | |
| Mouse Pet | | - | | |
| Mouse Paste n Go | | - | | |
| Mouse Gestures Suite | | - | | |
| Mouse Gesture Events | | - | | |
| Mouse Commander | | - | | |
| MoreSearchContextMenu | | - | | |
| More Search Engines in Context Menu | | - | | |
| MonkeyGestures | | - | | |
| Middle Mouse Button Scroll | | - | | |
| MenuManipulator | | - | | |
| Menu Filter | | - | | |
| Malware Search | | - | | |
| Make Link | | - | | |
| Make Bookmark | | - | | |
| Magic mouse cursor | | - | | |
| Mac Shortcuts | | - | | |
| Liquid Words | | - | | |
| Linky | | - | | |
| Link Text and Location Copier | | - | | |
| Link Ninja | | - | | |
| Less Labor Go To Dictionary | | - | | |
| Legacy link context menu | | - | | |
| Kill Quit | | - | | |
| Keyboard Shortcut | | - | | |
| Keyboard Control for Firefox | | - | | |
| Keybinder | | - | | |
| KeySnail | | - | | |
| Key config | | - | | |
| Internet Explorer Shortcuts | | - | | |
| InstaClick | | - | | |
| Inspect Context | | - | | |
| ImgPageDown | | - | | |
| Hyper Drag | | - | | |
| Hotkey Tabs | | - | | |
| Hard Refresh | | - | | |
| Grab and Drag | | - | | |
| Go To Top | | - | | |
| Glitter Drag | | - | | |
| Gesturefy | | - | | |