A Shopify store without a custom favicon shows the Shopify logo in browser tabs. That screams "I just launched." Here is how to fix it in two minutes.
Go to Online Store → Themes → Customize → Theme Settings → Favicon. Upload a 32x32 PNG. Shopify handles the rest. For best results across all devices, generate a complete favicon package with genfavicon.org first—you get all sizes plus the Shopify-compatible PNG in one ZIP.