Examine source code of Show Profile

{
  "manifest_version": 2,
  "name": "show-profile",
  "version": "0.9.13resigned1",
  "description": "Adds a prefix/postfix to the title of the firefox window",
  "applications": {
    "gecko": {
      "id": "show_profile@oliverpiltz.de",
      "strict_min_version": "48.0"
    }
  },
  "homepage_url": "http://www.oliverpiltz.de",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "show-profile.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}