Examine source code of Tab Reminder

{
  "name": "Tab Reminder",
  "description": "Turn any browser tab into a reminder. Close it now, come back to it later.",
  "version": "1.1.5",
  "manifest_version": 2,
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{44f116fd-5997-45ad-8cea-2e7f3fee75af}"
    }
  },
  "options_ui": {
    "page": "home.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "build/background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "notifications"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Tab Reminder",
    "default_icon": {
      "16": "/img/bell-16.png",
      "32": "/img/bell-32.png",
      "48": "/img/bell-48.png",
      "128": "/img/bell-128.png"
    }
  },
  "icons": {
    "16": "/img/bell-fill-16.png",
    "32": "/img/bell-fill-32.png",
    "48": "/img/bell-fill-48.png",
    "128": "/img/bell-fill-128.png"
  }
}