Examine source code of Save incognito session

{
  "manifest_version": 2,
  "name": "__MSG_extension_name__",
  "version": "0.3resigned1",
  "description": "__MSG_extension_description__",
  "author": "Marco Scarpetta",
  "homepage_url": "https://github.com/marcoscarpetta/save-incognito-session",
  "default_locale": "en",
  "icons": {
    "96": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "96": "icons/icon.svg"
    },
    "default_title": "__MSG_browser_action_title__"
  },
  "options_ui": {
    "page": "options/index.html",
    "browser_style": true
  },
  "incognito": "spanning",
  "permissions": [
    "cookies",
    "<all_urls>",
    "storage",
    "tabs"
  ],
  "applications": {
    "gecko": {
      "id": "save-incognito-session@scarpetta.eu"
    }
  }
}