pkg/54653: firefox 70 crashes

[ng0%n0.is@localhost]

>Number:         54653
>Category:       pkg
>Synopsis:       firefox 70 crashes
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 29 09:35:00 +0000 2019
>Originator:     ng0
>Release:        current
>Organization:
>Environment:
NetBSD 9.99.17 (GENERIC) amd64

>Description:
With a new build www/firefox version 70, I got a crash. I had to move to a different profile, but it still segfaults immediately while loading a website, now with:

console.warn: LoginManager: "searchLogins: `formActionOrigin` or `httpRealm` is recommended"
[1]   Segmentation fault (core dumped) /usr/pkg/lib/firefox/firefox "${@}"


With --safe-mode, I do get to:

JavaScript error: resource://gre/modules/UrlClassifierListManager.jsm, line 73: NS_ERROR_XPC_GS_RETURNED_FAILURE: ServiceManager::GetService returned failure code:
JavaScript error: resource://gre/modules/SafeBrowsing.jsm, line 303: NS_ERROR_XPC_GS_RETURNED_FAILURE: ServiceManager::GetService returned failure code:
console.warn: LoginManager: "searchLogins: `formActionOrigin` or `httpRealm` is recommended"
[1]   Segmentation fault (core dumped) /usr/pkg/lib/firefox/firefox "${@}"



This is with a gcc system, but there might be remains of an previous clang + libcxx system on it, pkgsrc build of firefox is with gcc.
>How-To-Repeat:

>Fix: