Examine source code of Opera (style) speed dial

{
  "description": "Opera style Speed dial",
  "manifest_version": 2,
  "name": "Opera speed dial",
  "version": "1.4resigned1",
  "homepage_url": "https://github.com/JohnRayson/Firefox-Speeddial",
  "icons": {
    "48": "icons/page-48.png"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "opera-speed-dial@mozilla.org",
      "strict_min_version": "45.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/page-32.png"
  }
}