Examine source code of Micro.blog

{
  "name": "Micro.blog",
  "description": "Save bookmarks to Micro.blog.",
  "manifest_version": 2,
  "version": "1.0",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png",
      "128": "icons/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{392ea3f3-6897-444a-abdb-b6d413ffae62}"
    }
  }
}