Examine source code of Quick Access for Lastline

{
  "manifest_version": 2,
  "name": "Quick Access for Lastline",
  "version": "1.1",
  "description": "This extension gives you context quick access menus for common menus in the Lastline Web UI",
  "icons": {
    "48": "icons/lastline.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite",
    "contextMenus",
    "storage",
    "menus"
  ],
  "applications": {
    "gecko": {
      "id": "lastlinequickaction@lastline.de"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "lastline_quick_access.js"
    ]
  }
}