https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66163
--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> --- Firefox developers just fixed first half of problem seen by null sanitizer and I would still wait for fixing the rest: https://bugzilla.mozilla.org/show_bug.cgi?id=1167119. Looks fixed issues are not sufficient to successfully run Firefox with LTO, let's wait for fixing the rest. Martin