Examine source code of Dark Mode Everywhere

{
  "manifest_version": 2,
  "name": "Dark Mode Everywhere",
  "description": "Every website gets a night look, automagically!",
  "version": "1.0.8",
  "author": "Peta Sittek",
  "homepage_url": "https://www.petasittek.com/dark-mode-everywhere/",
  "icons": {
    "16": "16.2a24ed1e.png",
    "32": "32.8bc48bc6.png",
    "48": "48.4b62d9a2.png",
    "128": "128.069da7a6.png"
  },
  "browser_action": {
    "default_title": "Dark Mode Everywhere",
    "default_popup": "popup.c1ae1433.html",
    "default_icon": {
      "16": "16.2a24ed1e.png",
      "19": "19.879e6e1c.png",
      "24": "24.25efd3a1.png",
      "32": "32.8bc48bc6.png",
      "38": "38.a5aae98a.png",
      "48": "48.4b62d9a2.png",
      "128": "128.069da7a6.png"
    }
  },
  "background": {
    "scripts": [
      "service-worker.57e779c2.js"
    ],
    "persistent": false
  },
  "commands": {
    "_execute_browser_action": {
      "description": "Activate the extension"
    },
    "dark-mode-on": {
      "description": "Turn on dark mode"
    },
    "dark-mode-off": {
      "description": "Turn off dark mode"
    },
    "dark-mode-toggle": {
      "description": "Toggle dark mode"
    }
  },
  "permissions": [
    "activeTab",
    "management",
    "scripting",
    "storage",
    "tabs",
    "webNavigation",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{96b07e36-75e4-4e25-a2ab-c8d5664d0074}"
    }
  }
}