How to stop this bot

hello,

Im looking for sloution -> stop this bot:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1

I dont know his name, but in server log I see lots of 404 errors made by this bot
Any ideas how to stop? Maybe add some restricions to htaccess?

thanks for advice