Examine source code of BibleGateway Dark

{
  "manifest_version": 2,
  "name": "BibleGateway Dark Mode",
  "version": "1.0",
  "description": "Applies a dark theme to BibleGateway.com for a more comfortable reading experience.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "https://www.biblegateway.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.biblegateway.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dca37ab1-d33a-42ac-bb06-fd8f57285e4e}"
    }
  }
}