Examine source code of Weekly Backlog Reminder

{
  "manifest_version": 2,
  "name": "Weekly Backlog Reminder",
  "version": "1.0",
  "description": "A simple add-on to set weekly reminders for pending tasks.",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Set Weekly Reminder"
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{aeb41fac-0c5e-45fa-921f-acdaad129fcf}"
    }
  }
}