Examine source code of SARS Notifier

{
  "manifest_version": 2,
  "name": "SARS Notifier",
  "version": "1.2.1",
  "description": "Plays a sound when a new student joins the SARS queue.",
  "permissions": [
    "https://sarsstem.miracosta.edu/sarsanywhere/*",
    "https://sarsweb.miracosta.edu/*"
  ],
  "web_accessible_resources": [
    "pizzicato.ogg"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://sarsstem.miracosta.edu/sarsanywhere/*",
        "https://sarsweb.miracosta.edu/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6a50781e-62e3-48c4-b7ae-16f4a2aa08db}"
    }
  }
}