Examine source code of Open with Switchbar

{
  "name": "__MSG_extName__",
  "description": "__MSG_extDesc__",
  "version": "1.0",
  "manifest_version": 2,
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "browser_action": {
    "default_title": "__MSG_extName__",
    "default_icon": {
      "16": "icon-16.png",
      "24": "icon-24.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "96": "icon-96.png",
      "128": "icon-128.png"
    }
  },
  "icons": {
    "16": "icon-16.png",
    "24": "icon-24.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  }
}