Examine source code of Content Scripts Extension

{
  "manifest_version": 2,
  "name": "Content Scripts Extension",
  "version": "1.0",
  "description": "Injects custom scripts and styles into web pages",
  "icons": {
    "48": "logo.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdb420ea-2f0e-4f2f-9ac7-869191dd7833}"
    }
  }
}