Examine source code of Nebulate

{
  "manifest_version": 3,
  "name": "Nebulate",
  "description": "Nebulate links YouTube and Nebula videos",
  "version": "0.2",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "js/content_script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "resources": [
        "assets/icon.png",
        "css/video.css",
        "css/channel.css"
      ]
    }
  ],
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs",
    "alarms"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://table.oenu.org/neb-table/lookup_table.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-nebulate@oenu.org"
    }
  }
}