From site i could see that to enable integration with browser if i install KeepassCX 2.6.0 using snap i need download script https://raw.githubusercontent.com/keepassxreboot/keepassxc/master/utils/keepassxc-snap-helper.sh

So i download it and try run

sh keepassxc-snap-helper.sh

but nothing happen while script code ii guess should output some message.

When i check script code i could see that it's try use this path /snap/bin/keepassxc.proxy but i don't have such file (and actually even /span folder). I install snapd only actually but this look as enough to run span: dnf install snapd

System is Fedora 32 with latest kernel. BTW. Fedora do not yet update KeepassCX and release version is still 2.5.4

KeePassXC - Version 2.6.0
Revision: 0765954
Distro: Snap
Operating System: Fedora 32 64 bit
Desktop Env: Gnome
Windowing System: Wayland

So as result i still cannot integrate KeepassXC with Firefox.