Examine source code of Night Mode Browsing

{
  "background": {
    "page": "background/index.html",
    "persistent": true
  },
  "browser_action": {
    "default_popup": "ui/popup/index.html",
    "default_title": "Darker Web Mode "
  },
  "commands": {
    "addSite": {
      "description": "__MSG_toggle_current_site__",
      "suggested_key": {
        "default": "Alt+Shift+A"
      }
    },
    "switchEngine": {
      "description": "__MSG_theme_generation_mode__"
    },
    "toggle": {
      "description": "__MSG_toggle_extension__",
      "suggested_key": {
        "default": "Alt+Shift+D"
      }
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "inject/fallback.js",
        "inject/index.js"
      ],
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "default_locale": "en",
  "description": "This extension will create style every website to match Night Mode Browsing.",
  "icons": {
    "16": "icons/dr_16.png",
    "48": "icons/dr_48.png",
    "128": "icons/dr_128.png"
  },
  "manifest_version": 2,
  "name": "Night Mode Browsing",
  "permissions": [
    "storage",
    "tabs",
    "idle",
    "<all_urls>"
  ],
  "version": "1.1"
}