Hello
The purpose of "firefox_getLatest.tcz" extension is to download any firefox version and language including the latest (by default), the script then creates a new firefox extension in your tce store or update directory in the case of an existing firefox extension while waiting a reboot.
firefox_getLatest can be run at anytime to get the latest
see the info file or " firefox_getLatest -h "for how to get an older or different version