Can you tell me where I can find this group?
You WERE told.
The URL is news://mozilla.support.firefox If you can click on the link
it should go directly to that newsgroup,IF who you access your
newsgroups from carries that group.
For newbies:
Newsgroups are different than web pages. A web page has a STATIC
address. In order words the physical file is located on ONE computer
somewhere and the URL points to it. Popular sites may be mirrored
elsewhere.
Newsgroups work differently. Your ISP or a third party provider
maintains a news server. These are linked to many thousands of other
news servers all over the world. In order to access any newsgroup,
your provider has to carry it. When somebody makes a post a physical
copy of it gets sends to every news server all over the world and what
you are accessing is that copy of the post or attachment. Not all
ISP's or third party providers carry every newsgroup. Even if they do
there can be delays or some parts of the file which are sent in
packets get "lost" and may not show up for awhile if ever.