Examine source code of Uthrive: Maximize rewards

{
  "name": "Uthrive: Use best cards for rewards & savings",
  "description": "Automatically use your best credit card to get maximum rewards and cashback",
  "version": "0.0.2.3",
  "manifest_version": 2,
  "icons": {
    "16": "Uthrive-logo-short16.png",
    "48": "Uthrive-logo-short48.png",
    "128": "Uthrive-logo-short128.png",
    "1024": "Uthrive-logo-short1024.png"
  },
  "browser_action": {
    "default_title": "Open the popup"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "clipboardWrite",
    "*://alpha-services.uthrive.club/*",
    "*://services.uthrive.club/*",
    "*://uthrive-resources.s3.amazonaws.com/*",
    "*://cognito-idp.us-east-1.amazonaws.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "./static/js/content.js",
        "./static/js/main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "./static/js/background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "/static/js/inject_script.js",
    "/static/js/main.js",
    "/*.css",
    "*.html",
    "static/media/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f64f61d-2abc-4037-9ed3-a79dadeff8a8}"
    }
  }
}