Yes it will, but you need to create a policy and be using version 60 which includes the Enterprise Policy Engine.
https://support.mozilla.org/en-US/products/firefox-enterpris...
The Enterprise Policy Generator add-on will help create the policy file.
I actually did the enterprise thing when I found out about it:
sudo defaults write /Library/Preferences/org.mozilla.firefox EnterprisePoliciesEnabled -bool TRUE"
echo "sudo defaults write /Library/Preferences/org.mozilla.firefox DisableAppUpdate -bool TRUE
shavar.services.mozilla.com
firefox.settings.services.mozilla.com