I noticed that the file /etc/udev/rules.d/70-snap.firefox.rules does not have any rules for the Trezor devices.
In my Trezor rules file, /etc/udev/rules.d/51-trezor.rules, that can be downloaded from https://data.trezor.io/udev/51-trezor.rules, I appended the FireFox snap TAG to one of the existing lines to get, for example:
I noticed that the file /etc/udev/ rules.d/ 70-snap. firefox. rules does not have any rules for the Trezor devices.
In my Trezor rules file, /etc/udev/ rules.d/ 51-trezor. rules, that can be downloaded from https:/ /data.trezor. io/udev/ 51-trezor. rules, I appended the FireFox snap TAG to one of the existing lines to get, for example:
KERNEL=="hidraw*", ATTRS{idVendor} =="1209" , ATTRS{idProduct }=="53c1" , MODE="0660", GROUP="plugdev", TAG+="uaccess", TAG+="udev-acl", TAG+="snap_ firefox_ firefox"
Unplug/replug the device and then try again in FireFox. That worked for me.