Test Regex expressions
Check DNS propagation all over the world
Check how your site/page looks from all over the world
Bulk test URLs
Single test redirects
Check meta tags
Browser cache busting
Make sure to check the “Disable cache” checkbox in your inspector to force it get a fresh version whenever your inspector is open!
Use your local “hosts” file to spoof DNS
on mac, you can add an entry to your /etc/hosts file to force your local computer to use a specific IP address for a domain. This is especially handy when about to launch a site as you can spoof the live domain to your server for final testing!