| Auto Confirm | | - | | |
| AppLauncher | | - | | |
| Analog Clock | | - | | |
| AlertStopper | | - | | |
| AlertCheck | | - | | |
| Alert the Developer | | - | | |
| Advanced History | | - | | |
| AddonFox - Best Firefox Addons! | | - | | |
| Addictive Typing Lessons | | - | | |
| Add-ons Manager Hilite | | - | | |
| Add-on Exporter | | - | | |
| Add-on Compatibility Reporter | | - | | |
| Add-on Builder Helper | | - | | |
| Adblock Plus Pop-up Blocker | | - | | |
| About Pages | | - | | |
| About Home Themer | | - | | |
| ASCIItoUnicode | | - | | |
| 2048 WebExtension | | - | | |
| 2048 Prime | | - | | |
