Examine source code of Base64 URL Decoder

{
  "manifest_version": 2,
  "name": "Base64 Decoder",
  "version": "0.1",
  "author": "arunpdl",
  "description": "Converts base64 encoded links and copies to clipboard and opens them in separate tab ",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "120": "icon120.png"
  },
  "permissions": [
    "contextMenus",
    "clipboardWrite",
    "storage"
  ]
}