Examine source code of Link Expiry Reminder

{
  "manifest_version": 2,
  "name": "Link Expiry Reminder",
  "version": "1.0.0",
  "description": "Set deadlines and reminders on any link or tab. Get notified before time-sensitive URLs expire.",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "alarms",
    "notifications",
    "storage",
    "tabs",
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon48.png"
    },
    "default_title": "Link Expiry Reminder"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "link-expiry-reminder@extension",
      "strict_min_version": "60.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}