Examine source code of Haiilo Enhancer

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "short_name": "HaiiloEnhc",
  "version": "1.1.5",
  "description": "__MSG_extensionDescription__",
  "author": "nichu42",
  "default_locale": "en",
  "homepage_url": "https://github.com/nichu42/haiilo-enhancer",
  "permissions": [
    "storage",
    "contextMenus",
    "activeTab",
    "scripting",
    "tabs",
    "webNavigation"
  ],
  "host_permissions": [
    "https://*.haiilo.app/*",
    "https://*.haiilo.com/*"
  ],
  "optional_host_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "background": {
    "scripts": [
      "shared.js",
      "i18n.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.haiilo.app/*",
        "https://*.haiilo.com/*"
      ],
      "js": [
        "shared.js",
        "i18n.js",
        "content.js"
      ],
      "css": [
        "colors.css",
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "_locales/*/messages.json"
      ],
      "matches": [
        "https://*/*",
        "http://*/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "__MSG_actionTitle__"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "haiilo-enhancer@nichu42.de",
      "strict_min_version": "128.0"
    }
  }
}