Sticky Ducky - clean the fixed elements Firefox

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manifest.json
{
  "manifest_version": 3,
  "name": "Sticky Ducky",
  "author": "Borys Lykah",
  "description": "Automatically cleans pages of the sticky headers and other fixed elements.",
  "version": "2.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "sticky-ducky@addons.mozilla.org",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "assets/icon48.png"
  },
  "icons": {
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "background": {
    "scripts": [
      "lib/underscore.js",
      "whitelist.js",
      "service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "lib/underscore.js",
        "lib/css-what.js",
        "explorer.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ]
}

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