Examine source code of Litcharts Dark Theme

{
  "manifest_version": 2,
  "name": "Litcharts Dark Theme",
  "version": "1.1",
  "description": "Dark theme for Litcharts",
  "icons": {
    "48": "images/darkLitcharts48.png",
    "96": "images/darkLitcharts96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.www.litcharts.com/*"
      ],
      "js": [
        "darkLitcharts.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "48": "images/darkLitcharts48.png",
      "96": "images/darkLitcharts96.png"
    },
    "default_title": "Toggle dark theme"
  }
}