I got this message 3 times in a row in my error log, after trying to click some of the icons on the street:
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[1000394.294561] [UFW BLOCK] IN=enp8s0 OUT= MAC=**:**:**:**:**:**:**:**:**:**:**:**:**:** SRC=192.168.**.** DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0xC0 TTL=1 ID=34254 PROTO=2
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(FYI: UFW = "Unix Firewall"; I play on Linux)
So it appears to be a matter of permissions. Since other browsers don't give this issue, it's probably some configuration inside FF that makes it so strict.