User JavaScript and CSS KL Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "User JavaScript and CSS",
  "version": "1.3",
  "description": "Inject your own custom JavaScript and CSS into any website.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    },
    "default_title": "User JavaScript and CSS",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{986c60d4-dba5-405b-8654-7b37b7111c19}"
    }
  }
}

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