firefox - Feddit UK

I would love to use Firefox more regularly, but the shortcut keys built into the browser are a pain in the butt. I haven't found a way to turn off the onboard keybindings so my own system wide keybinds will work.
I use an add-on called Retainer to setting your own shortcuts (https://addons.mozilla.org/es/firefox/addon/retainer/) maybe it can solve your problem.
Retainer – Consigue esta extensión para 🦊 Firefox (es)

Descargar Retainer para Firefox. Provides a keyboard shortcut (Shift + Alt + C by default) to create a new tab that retains the current/last-used container.