Examine source code of SnapMeasure

{
  "manifest_version": 2,
  "name": "SnapMeasure",
  "description": "Measure pixel distance and angle between two points on an image. Useful for UI/UX design.",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "content_style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "SnapMeasure",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "snapmeasure@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}