It usually works good, but last time FOE updated the game, it broke... and mainline is usually fairly quick to upload a fix.
Unfortunately, latest fix was more than a week ago, and still hasn't been approved.

Latest IS actually 4.2.1.1

So, I'm still waiting for them to approve it.

Yeah hi FOE devs. I am just writing this review to tell you that I am having a problem with FOE helpers - Firefox edtion - GB calculator and cost calculator. Yeah... the GB calculator only works for my own builds whereas it used to work for any GB I clicked on. The GB cost calculator can't even be used as it doesn't work at all. So any info would be greatly appreciated regarding the add on bringing these vital tools back online. Thanks

Der FOE-Helper ist essentiell für ein optimales Spielerlebnis bei FoE.
Ich nutze fast jedes Tool des Helpers täglich.
Wirklich großartige Arbeit!
Ich wünschte mir allerdings mehr Support für den FOE-Helper durch FOE und schnellere Bearbeitung der Updates durch den Firefox Store - der Helper hat es verdient.
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FOE-Helper is essential for a perfect FOE Game Experience.
I use almost any tool of the helper daily.
Really a great Job!
I would strongly appreciate better support for the helper by FOE and faster processing of updates by the firefox store - the helper earns it.

После последнего обновления ПЕРЕСТАЛ РАБОТАТЬ КАЛЬКУЛЯТОР ВЛОЖЕНИЙ в ВС других игроков.

После последнего обновления перестал работать калькулятор вложений в ВС других игроков.

После обновления на версию 4.0.1.0 перестал работать. Windows 7. Firefox 115.30.0esr. Старая версия FOE-Helper 3.13.1.0 при отключенном обновлении работает.

it will not load

I've been using it for years now and I'd be lost without it. I am still finding out new things I can do with it. it has become a necessary part of my FoE experience.

make sure you get the newest update since foe itself is frequently updating
- wenn man die neueste Version der helfers installiert sollte auch alles wieder klappe (sonst ggf. Verbündete temporär rausnehmen).