Examine source code of Parent Folder

{
  "manifest_version": 2,
  "name": "Parent Folder",
  "version": "1.0.4resigned1",
  "description": "Go to the parent folder with Alt-Up or toolbar button.",
  "author": "xia_sava",
  "homepage_url": "https://github.com/xia-sava/parent-folder",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "72": "icons/parent-folder.png"
  },
  "browser_action": {
    "default_icon": {
      "72": "icons/parent-folder.png"
    },
    "browser_style": true
  },
  "commands": {
    "parent-folder": {
      "suggested_key": {
        "default": "Alt+Up"
      },
      "description": "Go to the parent folder"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7db62c5-e42e-4cb7-acaf-5c22cb8bbf55}"
    }
  }
}