Examine source code of AWS Colorize

{
  "manifest_version": 2,
  "name": "AWS Colorize",
  "version": "0.2.1",
  "description": "Color codes your AWS header based on what account you are logged into.",
  "content_scripts": [
    {
      "matches": [
        "*://*.console.aws.amazon.com/*"
      ],
      "js": [
        "./src/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "./src/icons/aws-colorize-logo.png",
    "default_title": "AWS Colorize",
    "default_popup": "./src/popup/index.html"
  },
  "background": {
    "scripts": [
      "./src/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e9c9407d-5441-480d-863b-dd47b273ec11}"
    }
  }
}