Examine source code of Word Edge Extractor Addon

{
  "manifest_version": 2,
  "name": "Word Edge Extractor Addon",
  "version": "1.0.1",
  "description": "Show the first and last character of each word.",
  "browser_action": {
    "default_title": "Word Edges",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extract-word-edges-a8b3df9f-d5f2-4063-a7fa-085d214a97bd@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}