Examine source code of Remove Site Cookies

{
  "name": "Remove Site Cookies",
  "manifest_version": 2,
  "description": "Adds a context menu option to delete all cookies installed by the present web page.",
  "version": "1.2resigned1",
  "author": "LesStrater",
  "applications": {
    "gecko": {
      "id": "removeSiteCookies@SoftwareByArch.com",
      "strict_min_version": "57.0"
    }
  },
  "browser_action": {
    "default_icon": "rsc38x38.png",
    "default_title": "Remove cookies for this site",
    "browser_style": false
  },
  "icons": {
    "16": "rsc16x16.png",
    "48": "rsc48x48.png"
  },
  "permissions": [
    "https://*/",
    "http://*/",
    "contextMenus",
    "cookies",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "rsc_option.js"
    ]
  }
}