| Himawari 8 Satellite New Tab Page | | - | | |
| Highlight or Hide Search Engine Results | | - | | |
| High Definition Video | | - | | |
| HideMyAss - Free Web Proxy | | - | | |
| Hide Unwanted Results of Google Search | | - | | |
| Hatena Toolbar for Firefox | | - | | |
| Hatena Notify | | - | | |
| Hatena Bookmark | | - | | |
| Hateb Tweak | | - | | |
| Hacker News Feed | | - | | |
| HackSearch | | - | | |
| HTTPS highlighter | | - | | |
| HMA! IP Checker | | - | | |
| Groowe Search Toolbar | | - | | |
| Grey Google Theme | | - | | |
| Greasy Scripts | | - | | |
| Greasefire2 | | - | | |
| Greasefire | | - | | |
| GotoImageUrl | | - | | |
| Googlebar Lite | | - | | |
| GoogleReaderPlus | | - | | |
| GoogleLEFT | | - | | |
| GoogleImage | | - | | |
| GoogleEnhancer | | - | | |
| Google+ Share | | - | | |
| Google+ New Tab | | - | | |
| Google+ Bottom Right Icon Repositioning | | - | | |
| Google search link fix | | - | | |
| Google search Log off | | - | | |
| Google favicons | | - | | |
| Google by Image Restartless | | - | | |
| Google Viewer | | - | | |
| Google UnTracker | | - | | |
| Google Translator for Firefox | | - | | |
| Google Translator Tooltip Expanded 日本語版 | | - | | |
| Google Translator Lite | | - | | |
| Google Toolbar for Firefox | 2.0 | - | 4.0 | |
| Google Similar Images | | - | | |
| Google Sidewiki Client | | - | | |
| Google Shortener | | - | | |
| Google Shortcuts | | - | | |
| Google Selection Translate - For AltKey | | - | | |
| Google Search “View Image” Button | | - | | |
| Google Search by Image | | - | | |
| Google Reverse Image Search | | - | | |
| Google Redirects Fixer | | - | | |
| Google Reader Watcher | | - | | |
| Google Reader Monitor | | - | | |
| Google Reader List Opacity | | - | | |
| Google Reader Compact Mode | | - | | |