Examine source code of Favnekon3 Maker

{
  "manifest_version": 2,
  "name": "Favnekon3 Maker",
  "description": "__MSG_appDesc__",
  "version": "4.0",
  "default_locale": "en_US",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/n3k@64.png",
    "default_popup": "popup_db.html"
  },
  "web_accessible_resources": [
    "tools/*",
    "content_styles.css"
  ],
  "permissions": [
    "contextMenus",
    "<all_urls>",
    "tabs"
  ],
  "icons": {
    "64": "icons/n3k@64.png",
    "128": "icons/n3k@128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec832728-c32d-4482-a900-eea8e9814d29}"
    }
  }
}