Examine source code of SN Instances manager

{
  "manifest_version": 2,
  "name": "SN Instances manager",
  "version": "1.2.2resigned1",
  "author": "Songini Daniele",
  "icons": {
    "48": "icons/meNow.ico"
  },
  "browser_action": {
    "default_icon": "icons/meNow.ico",
    "default_title": "Manage Instance",
    "default_popup": "popup/manageInstance.html"
  },
  "options_ui": {
    "page": "settings/options.html"
  },
  "applications": {
    "gecko": {
      "id": "{50d1e25c-0a19-413b-82ed-de552f20639c}"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "SNInstancesManager.js"
      ]
    }
  ]
}