contentScript.js

const DEFAULT = {
  speed: 1.0,
  cbSetIntervalChecked: true,
  cbSetTimeoutChecked: true,
  cbPerformanceNowChecked: true,
  cbDateNowChecked: true,
  cbRequestAnimationFrameChecked: false,
};

let speedConfig = { ...DEFAULT };

function normalize(c) {
  const out = { ...DEFAULT, ...(c || {}) };
  out.speed = Math.max(0.05, parseFloat(out.speed) || 1);
  return out;
}

function broadcast(config) {
  speedConfig = normalize(config);
  document.dispatchEvent(new CustomEvent("hush-config", { detail: speedConfig }));
  window.postMessage({ command: "setSpeedConfig", config: speedConfig });
}

function injectTag() {
  if (document.getElementById("__hush_tag")) return;
  const s = document.createElement("script");
  s.id = "__hush_tag";
  s.src = chrome.runtime.getURL("injected.js");
  (document.documentElement || document.head).appendChild(s);
}

injectTag();

chrome.runtime.onMessage.addListener((req, sender, sendResponse) => {
  if (req.command === "setSpeedConfig") {
    broadcast(req.config);
    sendResponse({ ok: true, speed: speedConfig.speed });
  } else if (req.command === "getSpeedConfig") {
    sendResponse(speedConfig);
  }
  return true;
});

window.addEventListener("message", (e) => {
  if (e.data && e.data.command === "getSpeedConfig") {
    window.postMessage({ command: "setSpeedConfig", config: speedConfig });
  }
});