Examine source code of Enhanced GitHub

{
  "name": "Enhanced GitHub",
  "short_name": "Enhanced GitHub",
  "version": "6.1.0",
  "manifest_version": 3,
  "description": "Display repo size, size of each file, download link and option to copy file contents",
  "homepage_url": "https://github.com/softvar/enhanced-github",
  "author": "Varun Malhotra",
  "icons": {
    "16": "icons/enhanced-github16.png",
    "48": "icons/enhanced-github48.png",
    "128": "icons/enhanced-github128.png"
  },
  "action": {
    "default_icon": "icons/enhanced-github48.png",
    "default_popup": "popup.html",
    "default_title": "Enhanced GitHub"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webNavigation"
  ],
  "host_permissions": [
    "*://*.github.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "src/inject.js"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{72bd91c9-3dc5-40a8-9b10-dec633c0873f}",
      "strict_min_version": "42.0"
    }
  }
}