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Malformed package file?
Model MikroTik RBM33G Architecture MediaTek MT7621 ver:1 eco:3 Firmware Version OpenWrt 18.06.2 r7676-cddd7b4c77 / LuCI openwrt-18.06 branch (git-19.020.41695-6f6641d) Kernel Version 4.14.95 Local Time Tue Feb 26 01:43:12 2019

Looks like it did not download correctly for you:
wget -Ofirehol_3.1.6-1_all_18.06_all.ipk https://github.com/firehol/packages/releases/download/2018-08-19-1732/firehol_3.1.6-1_all_18.06_all.ipk
ls -l *.ipk
-rw-r--r-- 1 root root 115320 Feb 26 21:33 firehol_3.1.6-1_all_18.06_all.ipk
There are some checksum files available too, if you want to validate properly.
curl didn't work for me as well, wget works.