That is a something you have to create a printer options for each kinda prints your want to make and isn't something of a Browser but a printer driver setup options. So if the printers are networked you can install the driver for each printer but you might need to have different browser opened for each task so they will send to the right printer. But what your asking isn't part of the firefox browser environment here. But you should look online for help on printer setup to print to different printers.

but is some any other way to send task to printers directly from firefox, maybe with using addons?

You shouldn't have to the printer you setup will handle the print. And that is something from the printer drive software that install the print options. When you print from firefox it should bring up a list of printers to print to. Are you not seeing this option?

Yep, I can select printer from list in print window, but I want make this process automatic, without any user conformation. Because is too many customers buying in same time so I want make this process much faster