[Bug 267000] www/firefox declines to start if no GPU present.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267000

            Bug ID: 267000
           Summary: www/firefox declines to start if no GPU present.
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko@FreeBSD.org
          Reporter: dgilbert@eicat.ca
          Assignee: gecko@FreeBSD.org
             Flags: maintainer-feedback?(gecko@FreeBSD.org)

www/firefox and www/firefox-esr both "decline" to start if no GPU is present. 
This is a significant regression in firefox w.r.t. (say) jails, vms, and any
other situation where you might have multiple virtual VNC windows without any
GPU present.

... now I could have this wrong --- is there a library that need be installed
that isn't installed by default by installing Xvnc and firefox? (then it needs
be a port requirement).

... but in the alternative, can we force firefox to work (and just break only
when webgl ... or whathaveyou is engaged)?

to reproduce:

- create a jail on 13.1
- install firefox-esr and tightvnc
- start vncserver
- (probably start a window manager, etc.)
- try to start firefox(-esr)

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