CSUI main world on Firefox MV2 (Unexpected property "world" for scripting.registerContentScripts)

<script context="module" lang="ts">
  import type {
    PlasmoCSConfig,
    PlasmoGetInlineAnchor,
    PlasmoMountShadowHost
  } from "plasmo"

  export const config: PlasmoCSConfig = {
    matches: ["https://www.youtube.com/*"],
    world: "MAIN",
    run_at: "document_start"
  }

  export const getInlineAnchor: PlasmoGetInlineAnchor = () =>
    document.querySelector("#primary-inner > #below")

  export const mountShadowHost: PlasmoMountShadowHost = ({ 
    anchor, shadowHost 
  }) => {
    anchor!.element!.prepend(shadowHost)
  }
</script>

<script lang="ts">
  const player: any = document.getElementById("movie_player")
  console.log(player);
  console.log(player.getDuration());
  console.log(player.getCurrentTime());
</script>

<p style="color: white;">helloooooooooooooooo world</p>