Examine source code of oneclick-theme-switch

{
  "manifest_version": 3,
  "name": "oneclick-theme-switcher",
  "version": "1.0",
  "description": "Switches between dark and light theme with a single click",
  "background": {
    "page": "background.html"
  },
  "permissions": [
    "management",
    "storage",
    "contextMenus"
  ],
  "action": {
    "theme_icons": [
      {
        "light": "icons/action-dark.svg",
        "dark": "icons/action-light.svg",
        "size": 16
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "oneclick-theme-switch@janstuemmel.github.io",
      "strict_min_version": "109.0"
    }
  }
}