Comment 3 for bug 1947746

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mcudev (mcudev) wrote (last edit ):

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.