Install the LongTitles plug-in for Firefox from the Mozilla site. It's free. ;-) LiveJournal doesn't play nice with Firefox anyway, so I also use the IETabs add-on - it allows me to use IE within Firefox to render pages that don't work well with the Mozilla engine.
I think the problem the OP was describing is that the titles vanish too quickly to be readable - this is an old, well known bug in Firefox. In addition, Firefox doesn't wrap long titles - it truncates them (at 23 characters, I think). The LongTitles add-on addresses both of these problems. I wasn't able to view popup ALT text reliably on any web pages until I installed it.
My current version of Firefox -- just installed and all new and shiny -- won't even install LongTitles; it says it's intended for older versions, and that the bug has been fixed. Well. Isn't that special.
Titles in Firefox
Re: Titles in Firefox
Actually, the LongTitles plug-in doesn't cause the alt text to appear in mouseover, but the Popup ALT Attribute does.
I LOVE having a geeky sister!
Re: Titles in Firefox
Re: Titles in Firefox
Re: Titles in Firefox