Instapaper highlights exporter

Visit instapaper.com/notes and click the extension icon to export your highlights from Instapaper.
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "version": "1.0.0.0",
  "name": "Instapaper highlights exporter",
  "description": "Visit instapaper.com/notes and click the extension icon to export your highlights from Instapaper.",
  "applications": {
    "gecko": {
      "id": "[email protected]",
      "strict_min_version": "48.0"
    }
  },
  "background": {
    "scripts": [
      "assets/js/background.min.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.instapaper.com/*"
      ],
      "js": [
        "/assets/js/content-script.min.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "/assets/images/action-icon-38.png",
    "default_title": "Export Instapaper notes"
  },
  "permissions": [
    "https://www.instapaper.com/",
    "downloads",
    "tabs"
  ],
  "icons": {
    "16": "assets/images/icon-16.png",
    "32": "assets/images/icon-32.png",
    "48": "assets/images/icon-48.png",
    "64": "assets/images/icon-64.png",
    "128": "assets/images/icon-128.png"
  }
}