Examine source code of Booru Slideshow

{
  "manifest_version": 3,
  "name": "Booru Slideshow",
  "short_name": "Booru SS",
  "description": "View a slideshow from a Booru site based on your search.",
  "version": "10.6",
  "action": {
    "default_icon": "img/bs_icon_19.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1bb0deba-416a-4848-b119-9b94f37a268d}",
      "strict_min_version": "58.0"
    }
  },
  "incognito": "spanning",
  "icons": {
    "16": "img/bs_icon_16.png",
    "48": "img/bs_icon_48.png",
    "128": "img/bs_icon_128.png"
  },
  "permissions": [
    "unlimitedStorage",
    "storage",
    "webRequest",
    "declarativeNetRequestWithHostAccess",
    "downloads"
  ],
  "host_permissions": [
    "https://danbooru.donmai.us/*",
    "https://cdn.donmai.us/*",
    "https://derpibooru.org/*",
    "https://e621.net/*",
    "https://*.gelbooru.com/*",
    "https://konachan.com/*",
    "https://rule34.xxx/*",
    "https://safebooru.org/*",
    "https://xbooru.com/*",
    "https://yande.re/*"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_header_referer",
        "enabled": true,
        "path": "rules_header_referer.json"
      }
    ]
  }
}