Examine source code of Hydration Reminder Basic

{
  "manifest_version": 2,
  "name": "Hydration Reminder",
  "version": "1.0",
  "description": "Hydration Reminder. This widget helps users track their daily water intake and reminds them when they need to drink water.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/hydra-logo.png"
    }
  },
  "icons": {
    "128": "images/hydra-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{943c697e-483c-4dd7-848c-c015d3bd0fe3}"
    }
  }
}