| Feed Filter | | - | | |
| Feedly Notifier | | - | | |
| Feedly Notifier Plus | | - | | |
| Fess Google Bookmark Extension | | - | | |
| Film Info and Reviews | | - | | |
| Fire Shabelet | | - | | |
| Fire.fm | | - | | |
| FireStatus | | - | | |
| FireTube | | - | | |
| Fireflix | | - | | |
| Firefox Search Sidebar | | - | | |
| Firefox Share (alpha) | | - | | |
| Firefox Sync | | - | | |
| Flickr Gallery Plus! | | - | | |
| Floating Panel for YouTube | | - | | |
| Fluid twitter layout | | - | | |
| Fluidinfo | | - | | |
| FootieFox | | - | | |
| Forecast Plus | | - | | |
| Forecastfox | | - | | |
| Forecastfox (fix version) | | - | | |
| Forvo it! | | - | | |
| Fotofox | | - | | |
| FoxAge2ch | | - | | |
| FoxyTracks | | - | | |
| FoxyWebSearch | | - | | |
| FreeDictionaryPopPanel | | - | | |
| Frompo | | - | | |
| Fullsize Image viewer for GooglePlus | | - | | |
| FurAffinity Extender | | - | | |
| FurAffinity Filter | | - | | |
| Furaffinity Preview | | - | | |
| Furaffinity Submissions extension | | - | | |
| GBookmarks (Google Bookmarks for Firefox) | | - | | |
| GG.GG URL Shortener | | - | | |
| GMail Checker | | - | | |
| GReader Panel | | - | | |
| Gcache+ | | - | | |
| Gemini | | - | | |
| Geotool | | - | | |
| Gesture Translate | | - | | |
| Get Archive | | - | | |
| Get.tf URL Shortener | | - | | |
| Gish It! | | - | | |
| GitHub - Readme Table of Contents | | - | | |
| GitHub Extension Installer | | - | | |
| GitHub Suggest | | - | | |
| GitHub： Fixed | | - | | |
| Github Tweaks for Bugzilla | | - | | |
| Globefish | | - | | |
