Examine source code of Simple Habit Tracker

{
  "manifest_version": 2,
  "name": "Habit Tracker",
  "version": "1.0",
  "description": "tracker of habits",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "Tracked-48.png"
    }
  },
  "icons": {
    "48": "Tracked-48.png"
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7dd2bae2-ca3e-4681-91af-4f5afea280cb}"
    }
  }
}