Examine source code of YouTooltip

{
  "manifest_version": 3,
  "name": "YouTooltip",
  "description": "Adds a tooltip containing information about videos and playlists when hovering over a YouTube link.",
  "version": "1.8.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtooltip@johnh.addons.mozilla.org",
      "strict_min_version": "113.0"
    },
    "gecko_android": {
      "strict_min_version": "120.0"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "storage"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_icon": "icons/icon.svg",
    "default_title": "YouTooltip",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "backgroundScript.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "contentScript.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}