the salary is still 7000 + 1200 + 1250 (housing allowance) but now they pay an extra of 700 usd/month but paid every 6 months, so 4200 usd x 2 every year.
767 is in the process of being phase out in the coming years replaced by 787 but probably a few will remain including a couple of converted freighter.
So overtime is not frequent anymore. Routes are mainly african plus some asian like BKK DEL BOM an a few others
Regarding taxes, in ethiopia salary is tax free so it depends where you are resident and the rules of your country and if your country has any double taxation avoidance agreement with ethiopia.