| InFormEnter | | - | | |
| IME Area | | - | | |
| HiliteOnSelection | | - | | |
| Handy Calculator | | - | | |
| Free Textarea | | - | | |
| Fox Input | | - | | |
| Formlet | | - | | |
| FormSave | | - | | |
| Form Saver MOD | | - | | |
| Force Content-Type | | - | | |
| Focuser | | - | | |
| Focus Follows Input | | - | | |
| Find and Replace for FireFox | | - | | |
| Filtered clipboard | | - | | |
| File Title | | - | | |
| Enable Auto Complete | | - | | |
| EmotiConverter | | - | | |
| Emoji Keyboard | | - | | |
| Emoji Box | | - | | |
| Editor | | - | | |
| Edit any page | | - | | |
| Easy ■■■■ing | | - | | |
| Easy Markup | | - | | |
| Easy Copy Paste | | - | | |
| Easy AutoFocus | | - | | |
| Dummy Form Filler | | - | | |
| Drag-Select Link Text | | - | | |
| Digraphs | | - | | |
| Cycle Input Focus Plus | | - | | |
| Cycle Input Focus | | - | | |
| Copy Text without Selecting | | - | | |
| Copy Links | | - | | |
| Convert WebPage To PDF | | - | | |
| ContentEditable | | - | | |
| CoLT | | - | | |
| Closy | | - | | |
| Clipple | | - | | |
| Clippings | | - | | |
| Clipboard Plus | | - | | |
| Clear Text Fields | | - | | |
| Clear Input Field Text | | - | | |
| CheckFox | | - | | |
| CheckBoxMate Lefedor Edition | | - | | |
| Character Palette | | - | | |
| Change to Simple Text | | - | | |
| Casey Case Converter | | - | | |
| Case Changer | | - | | |
| BBComposer | | - | | |
| BBCodeXtra | | - | | |
| Autofill Forms | | - | | |