| Google Translator for Firefox | | - | | |
| Google UnTracker | | - | | |
| Google Viewer | | - | | |
| Google by Image Restartless | | - | | |
| Google favicons | | - | | |
| Google search Log off | | - | | |
| Google search link fix | | - | | |
| Google+ Bottom Right Icon Repositioning | | - | | |
| Google+ New Tab | | - | | |
| Google+ Share | | - | | |
| GoogleEnhancer | | - | | |
| GoogleImage | | - | | |
| GoogleLEFT | | - | | |
| GoogleReaderPlus | | - | | |
| Googlebar Lite | | - | | |
| GotoImageUrl | | - | | |
| Greasefire | | - | | |
| Greasefire2 | | - | | |
| Greasy Scripts | | - | | |
| Grey Google Theme | | - | | |
| Groowe Search Toolbar | | - | | |
| HMA! IP Checker | | - | | |
| HTTPS highlighter | | - | | |
| HackSearch | | - | | |
| Hacker News Feed | | - | | |
| Hateb Tweak | | - | | |
| Hatena Bookmark | | - | | |
| Hatena Notify | | - | | |
| Hatena Toolbar for Firefox | | - | | |
| Hide Unwanted Results of Google Search | | - | | |
| HideMyAss - Free Web Proxy | | - | | |
| High Definition Video | | - | | |
| Highlight or Hide Search Engine Results | | - | | |
| Himawari 8 Satellite New Tab Page | | - | | |
| HootBar | | - | | |
| HootSuite | | - | | |
| Host Pic.Org | | - | | |
| Hotmail Watcher | | - | | |
| Hover Translate | | - | | |
| HyperTranslate | | - | | |
| Hyperwords(tm) | | - | | |
| I Like Google! | | - | | |
| I REC ： +1 and Like in just a click | | - | | |
| IMDB Search | | - | | |
| IMDB Autofocus On Searchform | | - | | |
| IMDb Info | | - | | |
| IMDb rating | | - | | |
| IP Address Lookup | | - | | |
| IP Address and Domain Information | | - | | |
| IP to Geolocation | | - | | |
