- Edited
pillmuncher FlatPak Firefox can't communicate with KeePassXC
this is very well known known; it's happened to me and it's (sadly) normal since the flatpak is sandboxed. that doesn't mean it won't work in another browser. for a while. maybe it worked in firefox before but when it quits working it quits working. there's a thread where me and @axios spent days trying to figure out the flatpak to solus to keepass extension relationship. Could never get it to work was the conclusion because it wasn't a native package.
Anyway I solved this by liberating myself from the browser extension that I didn't trust anyway (it had too much control) and cutting and pasting [crtl b / ctrl c] straight from the keepassxc app itself. may seem primitive but its second nature now. edit: second nature for flatpak browsers.
2 cents