Compatibility Testing Browser engine Browser-driven checks (viewport emulation, responsive validation, cross-browser screenshots) should go through the qe-browser fleet skill ( ). Vibium is installed by . Quick reference: Cross-browser (Firefox/Safari) still requires Playwright or a cloud device farm today — Vibium's BiDi backend is Chrome-only at v26.3.x. <default to action When validating cross-browser/platform compatibility: 1. DEFINE browser matrix (cover 95%+ of users) 2. TEST responsive breakpoints (mobile, tablet, desktop) 3. RUN in parallel across browsers/devices 4. USE cloud service…