Firefox won't resolve local DNS names

If Chrome resolves local hostnames but Firefox doesn't, that usually points to Firefox using a different DNS path, cached information, or network settings than Chrome. '''A few things to check:''' '''1. Test whether Firefox can resolve the name at all''' In Firefox, try: http://hostname.local http://hostname If `.local` works but the short name doesn't (or vice versa), that helps narrow down whether it's a DNS or mDNS issue. '''2. Clear Firefox's DNS cache''' Firefox maintains its own DNS cache. '''Open:''' about:networking#dns Click Clear DNS Cache. Then try the hostname again. '''3. Check Firefox's DNS settings directly''' Open: about:preferences#general Scroll to Network Settings → Settings. '''Verify:''' * Enable DNS over HTTPS = Off * Proxy DNS when using SOCKS v5 = Off (if using SOCKS) * No unexpected proxy configured '''You can also open:''' about:config ''' Check:''' network.trr.mode '''Value should be: ''' 5 (disable DoH completely) or 0 (use platform DNS normally) '''If it's `2` or `3`, Firefox may still be attempting DoH.''' '''4. Check whether Firefox is using a proxy''' In `about:networking` look at the DNS and connection information. A common cause is: * Chrome → direct connection * Firefox → manual proxy, VPN proxy, SOCKS proxy, extension proxy '''Try:''' about:addons and temporarily disable VPN/privacy/network extensions.