Examine source code of Popup! Popup!

{
  "manifest_version": 2,
  "name": "Popup! Popup!",
  "version": "0.4.3resigned1",
  "description": "Open any URL in a popup",
  "applications": {
    "gecko": {
      "id": "{e8e1c2b5-60ae-45cf-b927-3ed3e6c50267}"
    }
  },
  "icons": {
    "16": "icons/logo.svg"
  },
  "background": {
    "scripts": [
      "lib/main.js",
      "background/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_action": {
    "default_title": "Popup! Popup!",
    "default_popup": "browser_action/browser_action.html",
    "browser_style": true,
    "default_icon": "icons/logo.svg"
  },
  "permissions": [
    "menus",
    "contextMenus",
    "activeTab",
    "tabs",
    "storage"
  ]
}