Examine source code of Task Tracke1

{
  "manifest_version": 2,
  "name": "Task Tracker",
  "version": "1.0",
  "description": "A simple to-do list to manage your daily tasks right from your Firefox toolbar.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Task Tracker",
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "task-tracker@hqaddon"
    }
  }
}