I support several users having this reoccurring problem (All Windows 10 w/ creators update, running webroot secureanywhere, but problem persists if webroot realtime protection + firewall is disabled) Periodically when firefox is running, but usually immediately on the second or third time firefox is launched after the computer starts up, a kernel panic occurs with the reference mentioning tcpip.sys. Examining the minidump with bluescreenview shows ntoskrnl.sys involved as well. I would not normally suspect this issue to be caused by firefox, but since switching the affected users to chrome or edge, not a single bluescreen has occurred. Out of curiosity I created a fresh firefox profile on one user's computer which had not bluescreened in days, launched firefox with the new profile, browsed to a website, closed firefox, launched it again, and immediately got another bluescreen referencing tcpip.sys. The users' firefox profile folders are normally in shares on a fileserver (in "my documents" via folder redirection) but the issue persists with profiles stored locally, fresh profiles, "refresh firefox", updating to "quantum" beta, and creating a shortcut for the users that always starts firefox in safe mode. The problem started roughly 2 weeks ago (week of march 12-16, reports were slow to come in) and all of the firefox installations have been kept up to date since then.