Save tabs to HTML file Firefox

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manifest.json
{
  "name": "Save tabs as HTML",
  "description": "Save list of open tabs as an HTML file.",
  "manifest_version": 2,
  "version": "0.3.5",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{61e28fc4-09a5-4dad-bb05-38ec2681ef86}"
    }
  },
  "permissions": [
    "tabs",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_title": "Save tabs as HTML."
  },
  "background": {
    "scripts": [
      "save_tabs.js"
    ]
  }
}

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