AMO:FAQ

How do I enable the sandbox?

What applications and versions are supported?

Please see the complete list here.

How do I delete my add-on?

Due to security concerns, it is not possible to delete an add-on once its GUID has been submitted to AMO. Instead, you can "disable" your add-on which will hide it from searches, display pages, and automatic updates. You can disable your add-on by clicking the Disable button on the Edit Add-on page. You can go back at any time and re-enable your add-on from the same page.