| YouTube Embed2Link | | - | | |
| YouTube Control Center | | - | | |
| YouTube Cleaner | | - | | |
| YouTube Cinema Mode . | | - | | |
| YouTube Center | | - | | |
| YouTube Auto Replay(11636) | | - | | |
| YouTube Auto Replay | | - | | |
| YouTube Approval Rating | | - | | |
| YouTube Anywhere Player | | - | | |
| YouTube 2 Player | | - | | |
| YouTube - Now Playing Notifications | | - | | |
| YouThumb | | - | | |
| YouNeed - Content indicator | | - | | |
| YouClean | | - | | |
| YggDore Sky Gate Toolbar | | - | | |
| Yahoo!ツールバー | | - | | |
| Yahoo! Weather in Statusbar | | - | | |
| Yahoo! Toolbar | | - | | |
| YTshowRating | | - | | |
| YT Video Thumbs by JSG | | - | | |
| YT Video Fix | | - | | |
| X-notifier lite (for Gmail，Hotmail， Yahoo) | | - | | |
| X-notifier | | - | | |
| WorldIP | | - | | |
| World of Warcraft Realm Status Tool | | - | | |
| Workspace | | - | | |
| WordReference Translator | | - | | |
| Wolfram Alpha Google | | - | | |
| WiseStamp | | - | | |
| WiktionaryMultiLanguageDictionary | | - | | |
| Wiktionary and Google Translate | | - | | |
| WikipediaWordChecker | | - | | |
| Wikipedia Peek | | - | | |
| Wikipedia Context Menu Search | | - | | |
| WikiTweak | | - | | |
| Wiki on Speed | | - | | |
| Wiki | | - | | |
| Who stole my pictures? | | - | | |
| Whimsy Pro | | - | | |
| Where to delete an account | | - | | |
| What's That Preference? | | - | | |
| Website SEO Analysis | | - | | |
| Website History | | - | | |
| Websecurify | | - | | |
| WebpageDateChecker | | - | | |
| Webcut | | - | | |
| WebVirusCheck XPI | | - | | |
| WebRank Toolbar | | - | | |
| WebComicTranslator | | - | | |
| Web2PDF Converter | | - | | |