Ian Tindale wrote to uk.transport.london on Tue, 25 Jan 2005:

Also, if you go to 'Tools' 'Extensions' there's plenty you can add to the
basic Firefox.

I've got Chatzilla (for irc) and Sage (for rss (don't ask - I'm not entirely
clear what rss is, myself)).

Nor am I, but I think it's to do with live websites - you can, for
instance put a "live bookmark" for BBC News on it, and the headlines in
the bookmark update themselves automagically throughout the day, which I
find quite remarkable.
--
"Mrs Redboots"
http://www.amsmyth.demon.co.uk/
Website updated 23 January 2005 with new photos