I don't know how safe it is, since I've been trying to bot "safely" for the last couple days. I might get banned in a week, I might not, I don't really care either way.
But I can say I did use this script from 1-50 firemaking over the course of a couple hours, while using some other scripts to bot the logs if necessary, and it went flawlessly. No proggie, sorry, but if anything I can vouch for efficiency of this bot haha. +1.
I'll try to report back in a week or so if this account got banned, but I'm also botting like every other skill on it while mixing it up with quests, so anything could be responsible really.