Is "PGO" still a valid option for firefox?

[Mikhail T.]

Hi! I enabled the PGO-option, but the build failed with the below error:

    gmake[3]: входимо до каталогу
    <</spare/usr/ports/www/firefox/work/firefox-45.0.2/obj-x86_64-portbld-freebsd10.2>>
    gmake[3]: *** Нема правила для створення цілі "pgo-profile-run". 
    Зупинка.
    (no rule to make target pgo-profile-run)

Is it even still a valid option, or did Mozilla allow it to bitrot? Thanks!

    -mi