See review D24326 for the patch.
A commit references this bug: Author: jbeich Date: Mon Apr 27 23:14:31 UTC 2020 New revision: 533209 URL: https://svnweb.freebsd.org/changeset/ports/533209 Log: www/firefox: update to 76.0 - Add a workaround for Clang [1] Changes: https://www.mozilla.org/firefox/76.0/releasenotes/ PR: 245422 Submitted by: tobik [1] Security: aec18162-eaf3-4e73-a38e-3fd98bc47869 Differential Revision: https://reviews.freebsd.org/D24326 Changes: head/www/firefox/Makefile head/www/firefox/distinfo head/www/firefox/files/patch-bug1288587 head/www/firefox/files/patch-bug1550891 head/www/firefox/files/patch-bug1612377 head/www/firefox/files/patch-bug1619258 head/www/firefox/files/patch-bug1622551 head/www/firefox/files/patch-bug1628567 head/www/firefox/files/patch-bug847568
A commit references this bug: Author: jbeich Date: Mon May 4 16:59:34 UTC 2020 New revision: 533932 URL: https://svnweb.freebsd.org/changeset/ports/533932 Log: MFH: r533209 r533408 www/firefox: update to 76.0 - Add a workaround for Clang [1] Changes: https://www.mozilla.org/firefox/76.0/releasenotes/ PR: 245422 Submitted by: tobik [1] Security: aec18162-eaf3-4e73-a38e-3fd98bc47869 Approved by: ports-secteam blanket Differential Revision: https://reviews.freebsd.org/D24326 Changes: _U branches/2020Q2/ branches/2020Q2/www/firefox/Makefile branches/2020Q2/www/firefox/distinfo branches/2020Q2/www/firefox/files/patch-bug1288587 branches/2020Q2/www/firefox/files/patch-bug1550891 branches/2020Q2/www/firefox/files/patch-bug1612377 branches/2020Q2/www/firefox/files/patch-bug1619258 branches/2020Q2/www/firefox/files/patch-bug1622551 branches/2020Q2/www/firefox/files/patch-bug1628567 branches/2020Q2/www/firefox/files/patch-bug847568