[Bug 270695] www/firefox: fails to render parts of some Web pages as of firefox-111

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270695

            Bug ID: 270695
           Summary: www/firefox: fails to render parts of some Web pages
                    as of firefox-111
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko@FreeBSD.org
          Reporter: david@catwhisker.org
          Assignee: gecko@FreeBSD.org
             Flags: maintainer-feedback?(gecko@FreeBSD.org)

This is running:
FreeBSD g1-97.catwhisker.org 12.4-STABLE FreeBSD 12.4-STABLE #1377
stable/12-n236087-95d0723eb308: Thu Mar 30 10:32:05 UTC 2023    
root@g1-70.catwhisker.org:/common/S1/obj/usr/src/amd64.amd64/sys/CANARY  amd64
1204500 1204500

with ports updated from a ports tree at main-n614944-8641bb99a224.
In particular, www/firefox is:

g1-97(12.4-S)[7] pkg info www/firefox
firefox-112.0_1,2
Name           : firefox
Version        : 112.0_1,2
Installed on   : Fri Apr  7 04:29:07 2023 PDT
Origin         : www/firefox
Architecture   : FreeBSD:12:amd64
Prefix         : /usr/local
Categories     : www wayland
Licenses       :
Maintainer     : gecko@FreeBSD.org
WWW            : https://www.mozilla.com/firefox
Comment        : Web browser based on the browser portion of Mozilla
Options        :
        ALSA           : on
        CANBERRA       : off
        DBUS           : off
        DEBUG          : off
        FFMPEG         : on
        JACK           : on
        LIBPROXY       : off
        LTO            : off
        OPTIMIZED_CFLAGS: on
        PROFILE        : off
        PULSEAUDIO     : on
        SNDIO          : off
        TEST           : off

Base FreeBSD and installed ports are updated daily (building each locally --
except for www/chromium).  (There have been no updates to FreeBSD stable/12
since 30 March -- as of this writing.]

An example Web page that exhibits the failure is https://xkcd.com/ --
firefox-110 and prior rendered the entire page, as does www/chromium
(chromium-111.0.5563.147); firefox-111 shows blank for the upper-left part of
the page; shows the main cartoon and the tooltip; shows buttons above and below
the cartoon (but not the names on the buttons).  When I slide the mouse around
in that upper-left corner, the cursor changes to indicate a link, and a
horizontal line shows up (where a graphic is expected to be).  Also, the
buttons (above & below the cartoon) are solid grey, but switch to white on
mouseover -- and the cursor switches to indicate a link.

Since it proved to be an issue for a different problem I was having with
firefox (drop-down menus would disappear as soon as I moved the mouse to try to
select an entry), I should point out that I am using a window manager that is a
derivative of tvtwm (and that has not been updated in years).  [For this issue,
the circumvention that I found was to define an environment variable,
XDG_SESSION_DESKTOP, to have the value "twm" in my X11 startup -- in my case,
in ~/.xsession.]

I see no errors emitted to ~/xsession-errors when I refresh the xkcd page.  (I
do see some errors for other pages -- e.g., whines about JavaScript errors.) 
Nor do I see anything at all interesting by examining the Web browser console
(F12; select "Console" & refresh the page.

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