Trisquel's main repository has atheros-firmware. Debian's non-free repository has firmware-atheros. They're different packages. Magic Banana is referring to open-ath9k-htc-firmware, which is the free replacement for firmware-atheros. If you would like to use open-ath9k-htc-firmware in a stable version of Debian you'll have to build it via

https://wiki.debian.org/ath9k_htc/open_firmware

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