My main concern was that I could not mark pages as unread, which is something I need to be able to do; the add-on had not been updated and the original author seemed to have disappeared. LinkVisitor 3.2 now works with Firefox 3, so I updated last week. All seems to be going OK, although I keep an eye on http://groups.google.co.uk/group/mozill ... rt.firefox
as various aspects have changed -E.g bookmarks are no longer HTML files, but a change in 'about:config' saves them as an HTML file when you close down.
AVG's toolbar does not work yet, so I had to remove that.
Installation was straight forward, although I did export my saved passwords; did a screen dump of my add-ons and made a copy of my profile folder, just in case there were any problems, or I wanted to revert.
Other than the above, all seems to be fine. (Using Firefox 3.01)