Firefox has some annoying problems and the recent version 3.5.2 has a problem with Flash player. I was going to Youtube and got the message that the Flash player was not installed. I saw on the FF site there are a number of comments about that and it is not a Mac problem.

Another (already old) problem is the History menu. When I select a link from the History menu, nothing happens. I open the menu again, which has now shifted down to include recent pages and it works.

A problem I sometimes have is that websites do not express Javascript and/or CSS and the site only shows the text. I noticed this problem, when FF was open for some time. Have no idea why this is so.