Examine source code of presstoplay.radio

{
  "manifest_version": 2,
  "name": "presstoplay.radio",
  "version": "1.0",
  "description": "One-click reliable radio",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "presstoplay.radio"
  },
  "permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{08b82ef2-5dfa-4110-9019-3dd05851fa4c}"
    }
  }
}