gistfile1.txt

function installAppFromManifestObj(obj) {
  //const {Cc, Ci, Cu, Cm} = require('chrome')
  var Cu = Components.utils
  Cu.import("resource://gre/modules/WebappsInstaller.jsm")
  var installParam = { 
    app: {
      manifest : obj,
      origin: obj.url
    }   
  }

  console.log(installParam)

  try {
    var app = WebappsInstaller.init(installParam)
    WebappsInstaller.install(installParam, obj).then(function success() {
      console.log('success!')
    }, function failure(error) {
      console.log('error', error)
    })  
  } catch(error) {
    console.log('exception', error)
  }
}


installAppFromManifestObj({
  "app": {
    "manifest": {
      "name":"Zimbra Web Client Sign In",
      "launch_path":"/zimbra/#1",
      "url":"https://mail.mozilla.com/zimbra/#1",
      "description":"Standalone: The Web in an App Form-factor.",
      "icons":{"16":"https://mail.mozilla.com/zimbra/img/logo/favicon.ico"}
    },
    "origin":"https://mail.mozilla.com/zimbra/#1"
  }
})

try:

var app = WebappsInstaller.init(installParam);
WebappsInstaller.install(installParam, obj).then( () => { ... notify success } );

totally untested! if it doesn't work, look at webappsUI.jsm:195... I based it from there

Gist updated to use new promises code. I'm not getting the typeerror exception anymore, but just silent failure now.

Felipe, in the new code, the manifest object appears to be passed to WebappsInstaller in three places, which is seems weird. Is that right?