To setup bouncer on Thunderbird first click on the Thunderbird menu button
then click on “New”
afterwards click on “chat account”
choose “irc” option
enter your nick and server e.g us9.ircnow.org or bnc1.ircnow.org or whatever your server is In this tutorial we are using bnc1. **You should set it to us9.ircnow.org as opposed to bnc1.ircnow.org.
enter your nickserv password
next make sure your port is set to 31337 and “ssl” is checked
once done click on Thunderbird menu again and from there click on “options”
next click on “options” again
in the search bar type your username/nick that you had set previously
from here we find our account number which is 6 in our case
next right click on empty area and click “New” and then “String”
type messenger.account.accountN.options.serverPassword in the field, N is the number of account. In our case it was 6
press ok and then enter your bouncer's username and password in the format username/password
That's all you are done!