Please provide more details. What were you doing? Where? Product Firefox Release Channel esr Version 52.3.0esr Build ID 20170802111520 OS Windows 7 OS Version 6.1.7601 Service Pack 1 bp-208fc233-888d-4d8c-91ed-a09680170828 Signature: mozilla::net::nsStandardURL::EqualsInternal qipcap.dll = Websense Data Endpoint sysfer.dll = Symantec CMC Firewall ipseng32.dll = Symantec Intrusion Detection = Symantec Corporation This is for Sumo's Related Bugs 1313085 NEW --- Crash in mozilla::net::nsStandardURL::EqualsInternal [Websense] ------------------ Update Websense. If the problem continues, disable it.