Since the end of last year, Yahoo! has stopped hosting news groups as forums.  As you may noticed, the web interfaces and all message histories have been removed.  Messages are now delivered only as email and there is no control to prevent SPAM and nuisance contributors.
We have the moves of firebird-java, firebird-support and firebird-general under way so far.  You should subscribe to the Google list and post all messages there from now on. For the link to a list's Google address, please visit https://firebirdsql.org/en/mailing-lists/
Firebird-php is moving also, but its new home currently needs work.