Examine source code of Adaptive Toolbar

{
  "manifest_version": 2,
  "name": "Adaptive Toolbar",
  "version": "1.0.2",
  "description": "Adaptive Toolbar is a Firefox extension designed to enhance your browsing experience by dynamically changing the color of the toolbar based on the theme-color property of the current website. Whether you prefer a seamless integration with the website's color scheme or have a custom theme in mind, Adaptive Toolbar gives you the flexibility to tailor your browser's appearance.",
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png"
  },
  "permissions": [
    "theme",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/logo-32.png",
    "default_title": "Adaptive Toolbar",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "w3color.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/inject.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "id": "adaptive-toolbar@thiboshoekje-2.be"
    }
  }
}