| Tumblr | | - | | |
| Tubepop | | - | | |
| Trust My Web | | - | | |
| True Whois Lookup | | - | | |
| Trello Japanizer | | - | | |
| TrashMail.net | | - | | |
| Transmaker | | - | | |
| Translator | | - | | |
| Translation Comparison | | - | | |
| TranslateWebpageAtGoogle | | - | | |
| TranslateMenu | | - | | |
| Translate This! | | - | | |
| Translate Now | | - | | |
| Translate Menu | | - | | |
| Transfer Assistance | | - | | |
| Track your shipment | | - | | |
| Total Validator | | - | | |
| Tombloo | | - | | |
| Tombfix | | - | | |
| Tohoku Epco Checker | | - | | |
| To Google Translate | | - | | |
| TinyURL Generator | | - | | |
| Tinderstatus | | - | | |
| TinEye Reverse Image Search | | - | | |
| Tile Tabs WE | | - | | |
| Thumbnail Zoom Plus | | - | | |
| Thumbnail Zoom | | - | | |
| Textise | | - | | |
| Text to Voice | | - | | |
| TexTra | | - | | |
| Terrace | | - | | |
| Terms of Service; Didn’t Read | | - | | |
| TepcoMeter for Firefox | | - | | |
| Tempomail | | - | | |
| Tags for YouTubeTM | | - | | |
| Tabliss | | - | | |
| TabelogStarNormalize | | - | | |
| TabTrekker | | - | | |
| TabCloud | | - | | |
| TV-FOX | | - | | |
| TM! Live | | - | | |
| StumbleUpon | | - | | |
| Stripped YouTube | | - | | |
| StopTube | | - | | |
| Stop YouTube Autoplay | | - | | |
| Stop Redirect Gmail Splash Page | | - | | |
| Step.to URL Shortener | | - | | |
| Springpad | | - | | |
| SourceForge Skip Download Countdown | | - | | |
| Soundcloud Button | | - | | |