A developer reported 37,856 leftover app clones after repeatedly force-stopping headless Chrome, with Mac startup appearing stuck near 5% for up to about 40 minutes. Chromium source confirms temporary app cloning and cleanup during normal shutdown, but the full duration of the delay was not experimentally explained. In the author’s Chrome 155 tests, disabling MacAppCodeSignClone prevented leftover clones. The issue concerns installed Chrome rather than Playwright’s default testing browsers. Any existing —disable-features list must be combined with the new option rather than overwritten.