Examine source code of DoneDaisy

{
  "name": "DoneDaisy",
  "description": "A Todoist browser extension for automatic Next Actions",
  "version": "1.1.0",
  "manifest_version": 2,
  "icons": {
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://todoist.com/*"
      ],
      "js": [
        "content/index.js"
      ],
      "css": [
        "content/index.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/*.png"
  ],
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  },
  "permissions": [
    "https://donedaisy.com/oauth/token",
    "identity",
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "nextaction@nextactionfortodoist.com",
      "strict_min_version": "57.0"
    }
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvIweK8d9cc1AwfPPJn57bd6YLSZ0jgq+RSZ98jHQxt7iNhBUqH2h4it1uIjMqGrnhrjS4dF9G1VxeOOGjqTf3ts7olNVBAmvmy+sUGdn1LvKGSWFwr7qIM9LS3eYLOxb4yWD0BkGhz1zKKM7LUx+YL190hKcz37UJIU7T2HjOK0I3EOnQ9y1lqExXssXhKmmJ8il069Q1cltiaWAUtYWCBmd+yX9opBL+EaJyfCHhergrF1FFT/pDHUA+a4Dxk9d8K8iPBdXKvJxpoNftMqoQZ1l48rgEQpehc4Upyifnm2PrPcWIbrrIw+mMobtmf0Y4ji2F5inRWPRZ+yp5NgycwIDAQAB"
}