| Firefox 2.0 Theme | | - | |
| Firefox 3 Aero theme for Firefox 4+ | | - | |
| Firefox 3 theme for Firefox 4+? | | - | |
| Firefox 3 theme for Firefox 4+ Reloaded! | | - | |
| Firefox Futurama | | - | |
| Firefox Tango Theme | | - | |
| Firefox Vista | | - | |
| Firefox Windows Classic | | - | |
| FormalGnome | | - | |
| FormalGnome Big | | - | |
| Foxdie | | - | |
| Foxdie (Graphite) | | - | |
| Fullscreen | | - | |
| Fusion Alternative | | - | |
| Fusion Alternative 2 | | - | |
| Fusion Kai | | - | |
| Futureyesterday | | - | |
| GNOME－Fx | | - | |
| GNOME－Fx－blue | | - | |
| GTK+ Native | | - | |
| Glassier | | - | |
| Glaze Black | | - | |
| Glaze FFSE Black | | - | |
| Gnome-Brave | | - | |
| Gnome-Human | | - | |
| Gnome-Noble | | - | |
| Gnome-Wine | | - | |
| Gnome-Wise | | - | |
| GoldShift | | - | |
| GrApple (Brazil Pro) | | - | |
| GrApple (Brazil) | | - | |
| GrApple (Brushed) | | - | |
| GrApple (Classic Pro) | | - | |
| GrApple (Classic) | | - | |
| GrApple (Default Pro) | | - | |
| GrApple (Default) | | - | |
| GrApple (Eos Pro) | | - | |
| GrApple (Eos) | | - | |
| GrApple (Graphite Pro) | | - | |
| GrApple (Graphite) | | - | |
| GrApple (Zaphod) | | - | |
| Grafari | | - | |
| GrayModern | | - | |
| Green Fox Lava RC1 | | - | |
| Green-Fox | | - | |
| GreenShift | | - | |
| HS-Fulda Theme | | - | |
| Haddan Dark-Gold | | - | |
| HaikuFox | | - | |
| HalloFF － Halloween Theme | | - | |
