Examine source code of Memo Tool Extension

{
  "manifest_version": 2,
  "name": "Memo Tool Extension",
  "version": "1.1",
  "description": "A simple memo tool",
  "icons": {
    "48": "icons/memo-icon-48.png",
    "96": "icons/memo-icon-96.png"
  },
  "permissions": [
    "tabs",
    "bookmarks"
  ],
  "browser_action": {
    "default_icon": "icons/memo-icon-32.png",
    "default_title": "Memo Tool Extension",
    "default_popup": "memo.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e2e45b38-24cd-4941-8612-c4b2638a95bb}"
    }
  }
}