Examine source code of Adaptive Darkmode

{
  "manifest_version": 2,
  "name": "Adaptive Darkmode",
  "version": "1.0",
  "description": "A simple add-on that lets you pick and choose what sites to apply a slick, dark mode to.",
  "icons": {
    "48": "dark-mode.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "functions.js",
        "darkModeLoader.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "functions.js",
      "darkModeLoader.js"
    ]
  },
  "browser_action": {
    "default_popup": "settings.html",
    "browser_style": true,
    "chrome_style": true
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b4627cb7-8a5f-4dd6-99be-ba85b0a14992}"
    }
  }
}