Examine source code of Click for frogs

{
  "manifest_version": 2,
  "name": "Frogges",
  "version": "1.0.0",
  "description": "Adds a 'click for frogs' button to your toolbar in the spirit of Tumblr.",
  "icons": {
    "16": "icons/frogge-16.png",
    "32": "icons/frogge-32.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/frogge-16.png",
    "default_title": "Click for frogs",
    "default_popup": "popup/frogge.html"
  },
  "web_accessible_resources": [
    "sounds/frogge.mp3",
    "icons/buttons/frogge-pink.png",
    "icons/buttons/frogge-green.png",
    "icons/buttons/frogge-yellow.png",
    "icons/buttons/frogge-red.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{abca8652-c0f5-4055-b11f-4996e45feb38}"
    }
  }
}