Examine source code of Sure Gardening

{
  "manifest_version": 2,
  "name": "Sure Gardening",
  "version": "2.0",
  "description": "Get helpful plant and garden care tips.",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icon48.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c872c84-d9ef-45d1-8656-3b19b1986313}"
    }
  }
}