Examine source code of HexDump - Hex Viewer

{
  "manifest_version": 2,
  "version": "0.1.3",
  "name": "HexDump - Hex Viewer",
  "description": "Display file contents in hexadecimal, and ascii",
  "permissions": [
    "storage"
  ],
  "homepage_url": "https://webextension.org/listing/hexdump.html",
  "icons": {
    "16": "/data/icons/16.png",
    "32": "/data/icons/32.png",
    "48": "/data/icons/48.png",
    "64": "/data/icons/64.png",
    "128": "/data/icons/128.png",
    "256": "/data/icons/256.png",
    "512": "/data/icons/512.png"
  },
  "background": {
    "scripts": [
      "/v2/chrome.action.js",
      "/v2/chrome.windows.create.js",
      "/v2/chrome.windows.get.js",
      "/v2/chrome.windows.getCurrent.js",
      "worker.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {}
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{9ce4fc51-a276-4593-8904-441a89171fa8}"
    }
  }
}