Mozilla Connect

Makes me wonder if that should be implemented as extension instead? I understand the need but also wish to keep the firefox itself lightweight.

I would like to support that idea. I want software to do only what I tell it to do. I don't want hidden automations that I am not aware of until it's too late. Currently you can mitigate it with setting places.history.expiration.max_pages to some ext...

Have you considered Duplicate Tabs Closer addon?https://addons.mozilla.org/en-US/firefox/addon/duplicate-tabs-closer/

I hope I am not too late. I would like to have ability to redefine every hotkey they way I like. And I would like to have None as a option also. Like in Games where I usually have separate config page for all the keys, and I have columns like key and...