User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

This issue is seen in Windows 10 and MAC, so assume it is something new ?

Menu icon > New > Chat Account

List of four items
Google Talk
IRC
Odnoklassniki
XMPP

Actual results:

Twitter is missing.

Not sure why there is a russian chat suddenly in this list.
Apparently, It s a popular program in Russia. Called classmates.

Expected results:

Expected Twitter in list
Did not expect some russian chat forum, especially as I'm using an English British download.

Why is Twitter missing? I have people in Support forum wanting to know where is Twitter. Can someone enlighten me as to what's going on?

OK so I've managed to get help from Wayne that pointed me to bug 1445778

Basically, Twitter is no longer supported.