Examine source code of Todo List Manager

{
  "manifest_version": 2,
  "name": "Todo List Manager",
  "version": "1.0",
  "description": "A Mozilla add-on to create and manage online todo lists.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{982dba09-e273-459f-a110-9155e3546b40}"
    }
  }
}