| HTML5 Notifications | | - | | |
| HFJ［今日の聖書］ | | - | | |
| Grocery List Generator | | - | | |
| Graphing Calculator Toolbar | | - | | |
| GlassMyFox | | - | | |
| Geolocation | | - | | |
| Furigana Inserter Dictionary | | - | | |
| Freenode IRC Client | | - | | |
| FoxSaver | | - | | |
| FoxNotes | | - | | |
| Fox-Extras | | - | | |
| FloatNotes | | - | | |
| FlipClock | | - | | |
| Fireword Generator for Firefox | | - | | |
| FirefoxView | | - | | |
| Firefox OS Simulator | | - | | |
| FireTrack | | - | | |
| FireRun | | - | | |
| FirePop! | | - | | |
| FireMath | | - | | |
| FireHash | | - | | |
| FireFiles | | - | | |
| FireBreak | | - | | |
| Fire Sticky | | - | | |
| Fire Encrypter | | - | | |
| Fire Commander | | - | | |
| File Manager | | - | | |
| File Info | | - | | |
| Fidget Spinner | | - | | |
| Fastnote | | - | | |
| FXChromeMods | | - | | |
| Eyes Alarm | | - | | |
| External Application Buttons 2 | | - | | |
| ExponentCopy | | - | | |
| EpubPress - Read the web offline | | - | | |
| Element Inspector | | - | | |
| Element Hiding Helper for Pan | | - | | |
| Egg Timer | | - | | |
| EasyCal | | - | | |
| Easy Access | | - | | |
| EPUBReader | | - | | |
| DropTimePlusZ | | - | | |
| DropTime | | - | | |
| Drag-n-Drop Multiple Files | | - | | |
| Downloads Context Menu | | - | | |
| Don't Panic | | - | | |
| Divel Notepad | | - | | |
| Disable clipboard manipulations | | - | | |
| Dice Thrower | | - | | |
| Date difference and Age calculator | | - | | |
