FlexHeaders - Modify HTTP Headers Firefox

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manifest.json
{
  "manifest_version": 3,
  "name": "FlexHeaders - Modify & Edit HTTP Headers",
  "description": "Modify, Add & Remove headers for any request, filter by URL, share headers with others, and import/export settings.",
  "version": "1.8.1",
  "icons": {
    "128": "/logo128.png"
  },
  "permissions": [
    "storage",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "/app.html",
    "default_icon": {
      "128": "/logo128.png"
    }
  },
  "options_page": "/app.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "flexheaders@harrisondeo.me.uk",
      "strict_min_version": "113.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}

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