Firefox doesn't connect the Yandex.Metrica script?

Question

Yandex

Connected the generated metric code on all pages. On pressing some buttons I set a goal fixation

yaCounterXXXXX.reachGoal('tag')

but for some reason it works everywhere except Firefox. It shows an error in the console

ReferenceError: yaCounterXXXXX is not defined

The mc.yandex.ru/metrika/watch.js metric script is connected, but at the same time on the page the same script is connected several more times from the social button scripts. It seems to be present inside the head, but not connected.

Answer 1

It is better to solve this on a living example.
Show the site?

Answer 2

This story happens to everyone on Firefox older than (55?)56.x, moving to a new engine. We are waiting for all the jambs to be fixed, or maybe they will not be fixed. Many Yandex widgets do not work.