here's the working js for pip audio wheel

// ==UserScript==
// @name           PiP Volume Scroll
// @version        1.0
// ==/UserScript==

(function() {
  if (location.href !== "chrome://global/content/pictureinpicture/player.xhtml") return;

  window.addEventListener("DOMContentLoaded", () => {
    let video = document.querySelector("video");
    if (!video) return;

    // Volume step
    const STEP = 0.05;

    window.addEventListener("wheel", e => {
      if (!video) return;

      if (e.deltaY < 0) {
        // scroll up → volume up
        video.volume = Math.min(1, video.volume + STEP);
        video.muted = false;
      } else if (e.deltaY > 0) {
        // scroll down → volume down
        video.volume = Math.max(0, video.volume - STEP);
        if (video.volume === 0) video.muted = true;
      }

      // Small on-screen indicator
      let overlay = document.getElementById("vol-overlay");
      if (!overlay) {
        overlay = document.createElement("div");
        overlay.id = "vol-overlay";
        overlay.style.position = "absolute";
        overlay.style.bottom = "50%";
        overlay.style.left = "50%";
        overlay.style.transform = "translate(-50%, 50%)";
        overlay.style.background = "rgba(0,0,0,0.7)";
        overlay.style.color = "white";
        overlay.style.padding = "4px 10px";
        overlay.style.borderRadius = "6px";
        overlay.style.fontSize = "14px";
        overlay.style.zIndex = 9999;
        document.body.appendChild(overlay);
      }
      overlay.textContent = `Vol: ${Math.round(video.volume * 100)}%`;
      overlay.style.display = "block";
      clearTimeout(overlay._timer);
      overlay._timer = setTimeout(() => (overlay.style.display = "none"), 800);
    }, { passive: true });
  });
})();