Examine source code of Ruby Switch

{
  "manifest_version": 3,
  "name": "Ruby Switch",
  "version": "1.0.4",
  "description": "Toggles visibility of ruby text such as furigana for Japanese kanji.",
  "author": "Steve A. Doria",
  "homepage_url": "https://blog.stevedoria.net/20230712/ruby-switch",
  "icons": {
    "48": "icons/rubyswitch-48.png",
    "96": "icons/rubyswitch-96.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "action": {
    "default_icon": "icons/rubyswitch-32.png",
    "default_title": "Ruby Switch",
    "default_area": "navbar"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rubyswitch@stevedoria.net",
      "strict_min_version": "115.0"
    },
    "gecko_android": {
      "id": "rubyswitch@stevedoria.net",
      "strict_min_version": "115.0"
    }
  },
  "background": {
    "scripts": [
      "rubyswitch.js"
    ]
  }
}