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Doesn't start with firejail on Debian (Channel error: cannot send/recv)

After installing LibreWolf on Debian11/KDE (it's not yet in its repos) I get these errors when trying to start it with firejail:

###!!! [Parent][MessageChannel] Error: (msgtype=0x3A0006,name=PContent::Msg_ConstructBrowser) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x3A0145,name=PContent::Msg_CommitBrowsingContextTransaction) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0xB1000E,name=PWindowGlobal::Msg_SetContainerFeaturePolicy) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x3A0145,name=PContent::Msg_CommitBrowsingContextTransaction) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x230075,name=PBrowser::Msg_InitRendering) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x2300A8,name=PBrowser::Msg_SafeAreaInsetsChanged) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x3A0145,name=PContent::Msg_CommitBrowsingContextTransaction) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x230071,name=PBrowser::Msg_Show) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x3A0145,name=PContent::Msg_CommitBrowsingContextTransaction) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x23007A,name=PBrowser::Msg_UpdateDimensions) Channel error: cannot send/recv

Is this solely a firejail issue? And if so, any clues what could be causing this? It has a /etc/firejail/librewolf.profile.

The syslogs only had this:

hostname kernel: [...] audit: type=1400 audit(...): apparmor="DENIED" operation="exec" profile="firejail-default" name="/usr/share/librewolf/librewolf" pid=991543 comm=53616E64626F7820466F726B6564 requested_mask="x" denied_mask="x" fsuid=1000 ouid=1000
hostname kernel: [...] audit: type=1400 audit(...): apparmor="DENIED" operation="exec" profile="firejail-default" name="/usr/share/librewolf/librewolf" pid=991555 comm=53616E64626F7820466F726B6564 requested_mask="x" denied_mask="x" fsuid=1000 ouid=1000
hostname kernel: [...] audit: type=1400 audit(...): apparmor="DENIED" operation="exec" profile="firejail-default" name="/usr/share/librewolf/librewolf" pid=991643 comm=53616E64626F7820466F726B6564 requested_mask="x" denied_mask="x" fsuid=1000 ouid=1000