Examine source code of Ariston MoodFeed

{
  "manifest_version": 2,
  "name": "Ariston MoodFeed",
  "version": "2.3resigned1",
  "description": "Ariston Moodfeed - Update your mood.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "applications": {
    "gecko": {
      "id": "moodfeed@ariton.org",
      "strict_min_version": "45.0"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "MoodFeed",
    "default_popup": "popup/popup.html"
  }
}