[lionelw]

>still no way to remap Ctrl+T to open a new tab in the current container context

A quick search found me this: https://addons.mozilla.org/en-US/firefox/addon/new-container..., using Alt+C. There are other similar addons too.

I'll assume given the solution was pretty easy to find, your issue must be with the inability to repurpose Ctrl+T...