Examine source code of lecjo

{
  "applications": {
    "gecko": {
      "id": "lecjo@mozilla.org",
      "strict_min_version": "45.0"
    }
  },
  "description": "Play audio file dna",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/lecjo/",
  "manifest_version": 2,
  "name": "Lecjo",
  "permissions": [
    "storage"
  ],
  "version": "2.0.2.7resigned1",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "adaptateur.js",
        "table.js",
        "constructeur.js",
        "background.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/lecjo-32.png"
  },
  "options_ui": {
    "page": "exemple/index.html"
  }
}