console.error: simple-download-addon:
  fail:
  Should not be any unexpected tabs open
console.trace: simple-download-addon:
_ecated/unit-test.js 108 fail
_ecated/unit-test.js 340 done/<
_/Promise-backend.js 920 Handler.prototype.process
_/Promise-backend.js 799 this.PromiseWalker.walkerLoop
_/Promise-backend.js 738 this.PromiseWalker.scheduleWalkerLoop/<
                     0

console.log: simple-download-addon: Windows open:
console.log: simple-download-addon: chrome://browser/content/browser.xul - about:blank, about:blank, about:blank
console.log: simple-download-addon: [JavaScript Warning: "TypeError: useless expression" {file: "resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/util/sequence.js" line: 333}]
console.error: simple-download-addon:
JPM undefined   Message: TypeError: tab is undefined
  Stack:
    getOwnerWindow@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/utils.js:105:1
getTabBrowserForTab@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/utils.js:187:18
activateTab@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/utils.js:48:18
Tab<.activate<@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/tab-firefox.js:185:5
invoke@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/lang/functional/helpers.js:28:42
setImmediate/<@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/timers.js:79:27
dispatcher@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/timers.js:70:13