Examine source code of Recipe Folder

{
  "manifest_version": 2,
  "background": {
    "scripts": [
      "jquery-3.2.1.min.js",
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "jid1-7EoRe5x6BrAyXQ@jetpack",
      "strict_min_version": "45.0"
    }
  },
  "name": "Recipe Folder",
  "description": "Save Recipes to your Recipe-Folder Account",
  "version": "1.2.2resigned1",
  "browser_action": {
    "default_icon": "images/icon-128.png",
    "default_title": "Save Recipe"
  },
  "homepage_url": "http://recipe-folder.com",
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "storage",
    "cookies"
  ],
  "web_accessible_resources": [
    "images/x.png",
    "images/ajax-loader.gif"
  ]
}