Examine source code of WaniKani Notifier

{
  "name": "__MSG_wanikaninotify_name__",
  "version": "0.4.95",
  "manifest_version": 2,
  "description": "__MSG_wanikaninotify_description__",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.wanikani.com/review/session",
        "*://www.wanikani.com/lesson/session"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "alarms",
    "menus",
    "notifications",
    "storage",
    "tabs",
    "https://api.wanikani.com/v2/*"
  ],
  "browser_action": {
    "default_title": "WaniKani Notifier",
    "default_icon": "icons/icon_48.png",
    "browser_style": false
  },
  "web_accessible_resources": [
    "icons/icon_128.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@wanikani-notifier",
      "strict_min_version": "107.0"
    }
  }
}