Examine source code of Refined GitHub

{
  "$schema": "https://json.schemastore.org/chrome-manifest",
  "name": "Refined GitHub",
  "version": "26.6.7",
  "description": "Simplifies the GitHub interface and adds useful features",
  "homepage_url": "https://github.com/refined-github/refined-github",
  "manifest_version": 3,
  "minimum_chrome_version": "123",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4c4eda4-fb84-4a84-b4a1-f7c1cbf2a1ad}",
      "strict_min_version": "128.0"
    },
    "gecko_android": {
      "strict_min_version": "128.0"
    }
  },
  "permissions": [
    "storage",
    "scripting",
    "contextMenus",
    "activeTab",
    "alarms"
  ],
  "host_permissions": [
    "https://github.com/*",
    "https://api.github.com/*"
  ],
  "action": {
    "default_icon": "assets/icon.png"
  },
  "optional_host_permissions": [
    "*://*/*"
  ],
  "icons": {
    "128": "assets/icon.png"
  },
  "options_page": "assets/options.html",
  "background": {
    "service_worker": "assets/background.js",
    "type": "module",
    "scripts": [
      "assets/background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://github.com/*",
        "https://gist.github.com/*"
      ],
      "exclude_matches": [
        "https://*/login/*"
      ],
      "css": [
        "assets/refined-github.css"
      ],
      "js": [
        "assets/content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*"
      ],
      "matches": [
        "https://*/*"
      ]
    }
  ]
}