Enabling things in Flatseal won’t do for the Librem 5 - there’s work in other places that needs to happen, IIRC from what I’ve heard this also needs a newer stack (Crimson instead of Byzantium, Debian 12, not 11) to work.
I need to play with my PinePhone Pro again - it’s far along in terms of libcamera support, from what I read video conferencing in Firefox may work now - but, to put things into perspective, even if that works now, I would never use it as a daily driver instead of my L5, for audio trouble and battery life issues alone.