I waited so many years for this add-on Rated 5 out of 5 stars

I cannot find an icon or mention in the menu bar. Where must I start? I found the instruction movie - no clue. This add-on is topmost essential so I will try again and again until I find the entry to develop my digital train collection.
I am male 75+ so certainly within the target group of this add-on. Highly recommended!

This review is for a previous version of the add-on (1.0.1-signed). 

Hello,

Sorry. I’ve just submitted an update to Firefox. This version fixes the bug