[Bug 246687] www/firefox tab crashes on some sites with their own fonts

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246687

            Bug ID: 246687
           Summary: www/firefox tab crashes on some sites with their own
                    fonts
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: freebsd.68fba at nospam.spacesurfer.com
          Assignee: gecko at FreeBSD.org
             Flags: maintainer-feedback?(gecko at FreeBSD.org)

If firefox is configured to allow pages to choose their own fonts and you visit
a uk government website (https://www.gov.uk/) the tab crashes.

If you configure firefox to disallow pages to choose their own fonts the tab
works fine. 

This has been happening for some time (at least 3 months, but possibly much
longer). I just tried this with firefox-76.0_3,1 on FreeBSD 12.1 amd64 and with
a brand new profile.

Note that with firefox for OS X this doesn't happen, so the issue appears to be
specific to FreeBSD.

I am a very heavy user of firefox on FreeBSD and this only ever seems to happen
for uk government websites, they seem to provide their own fonts.

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