Examine source code of Morse

{
  "name": "Morse",
  "description": "Encode and decode morse code.",
  "version": "1.0.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "omnibox": {
    "keyword": "#"
  },
  "icons": {
    "16": "./icons/16.png",
    "32": "./icons/32.png",
    "48": "./icons/48.png",
    "128": "./icons/128.png"
  }
}