Examine source code of Ecosia Dark Mode

{
  "name": "Ecosia Dark Mode",
  "version": "1.4.3.1",
  "description": "A dark theme for the Ecosia search engine",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Ecosia dark",
    "default_icon": {
      "16": "images/EcosiaLogo16.png",
      "32": "images/EcosiaLogo32.png",
      "48": "images/EcosiaLogo48.png",
      "128": "images/EcosiaLogo128.png"
    }
  },
  "icons": {
    "16": "images/EcosiaLogo16.png",
    "32": "images/EcosiaLogo32.png",
    "48": "images/EcosiaLogo48.png",
    "128": "images/EcosiaLogo128.png"
  },
  "web_accessible_resources": [
    "images/EcosiaLogo.png",
    "pages/Close.png",
    "injection-styling/blog-page.css",
    "injection-styling/home-page.css",
    "injection-styling/images-page.css",
    "injection-styling/information-page.css",
    "injection-styling/login-page.css",
    "injection-styling/news-and-videos-page.css",
    "injection-styling/search-page.css",
    "injection-styling/settings-page.css",
    "injection-styling/shopping-page.css",
    "injection-styling/universal-styling.css"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.ecosia.org/"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/home-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/?*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/home-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/search*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/search-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/images*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/images-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/shopping*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/shopping-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/news*",
        "https://www.ecosia.org/videos*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/news-and-videos-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/account/login*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/login-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.ecosia.org/settings*"
      ],
      "js": [
        "injection-scripts/universal-script.js",
        "injection-scripts/settings-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "https://info.ecosia.org/*",
        "https://ecosia.zendesk.com/*"
      ],
      "js": [
        "injection-scripts/information-page.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bbd0ef9e-ac53-4239-b2ea-2b38f4b92566}"
    }
  }
}