I seeked into the API in order to write a plugin for myself. In order to aid my workflow I need to listen to two keystrokes closely followed.
Apparently there are only hacks available.
I want to fire-and-forget about my plugin as long as the API to command firefox stays consistent.
I did not attempt to write any code (and any JS code, honestly that is) yet. Simply because I did not get that requirement addressed by the official API /& documentation.
Recompiling firefox would be the least favorable option; But I would still be hooked if it would enable me to observe keystrokes on my own.
As an practical example:
Pressing Shift two times in sequence and within 100 ms should enable me to eat the event.
I had to live for three years in frankanian and two more sufferable years in bavarian.
When beeing in thr south of Germany I only found friends in East-Germany or North-rhein-westphalia. I suppose to the North of my houses I would be fine too. But thr southern folks of Germany are following money and representation.
Everywhere else you do not have to be judged.
The South of Germany are also blind to Changes in my experience. I would never recommend any friend to go there. Instead check out the netherlands if your are left- or Poland if your are conservative-aligned and outside from yurop.