Examine source code of KeyBid ROI Calculator

{
  "manifest_version": 2,
  "name": "KeyBid ROI Calculator",
  "version": "1.1.0",
  "description": "KeyBid ROI Calculator - Regim Hotelier",
  "browser_specific_settings": {
    "gecko": {
      "id": "keybid-roi-calculator@keybid.ro",
      "strict_min_version": "115.0"
    }
  },
  "browser_action": {
    "default_title": "KeyBid ROI Calculator",
    "default_popup": "popup/index.html"
  },
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "https://storia.ro/*",
    "https://www.storia.ro/*",
    "https://imobiliare.ro/*",
    "https://www.imobiliare.ro/*",
    "https://olx.ro/*",
    "https://www.olx.ro/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://storia.ro/*",
        "https://www.storia.ro/*",
        "https://imobiliare.ro/*",
        "https://www.imobiliare.ro/*",
        "https://olx.ro/*",
        "https://www.olx.ro/*"
      ],
      "js": [
        "content/index.js"
      ],
      "css": [
        "content/style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "assets/*"
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ]
  }
}