WebIDE is the code name of the new [https://developer.mozilla.org/en-US/Firefox_OS/Using_the_App_Manager App Manager]. As for today, WebIDE only supports Firefox OS Apps (hence the name: App Manager).
Status: Not built by default (add `ac_add_options --enable-devtools-webide` to your mozconfig, and make sure Should be in Firefox Nightly the pref 13th. Set `devtools.webide.enabled` is set to `true`).
WebIDE allow the user to: