Examine source code of Meme image saver

{
  "manifest_version": 2,
  "name": "Meme image saver",
  "version": "1.0",
  "description": "Presents a right-click menu option to save an image in a designated memes folder.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "menus",
    "storage",
    "tabs",
    "activeTab",
    "downloads",
    "<all_urls>"
  ]
}