I have created a little tooltip framework, which works fine in all modern browsers. There's one thing that really bugs me: in Firefox this seems to disable displaying a regular title (from the `title` attribute). I can't find a cause for this. It's not the `mouseover` handler that I assign for certain elements, because on regular (non handled) elements, titles are not displayed either. Furthermore I experimented width this (see [this jsfiddle][1] and it was not replicable) Can this be some known Firefox bug (searched the internet for that, but found nothing relevant) or am I doing something wrong in my scripting/html/css? I've put the whole thing in this [jsfiddle][2]. Any brainwave is welcome ... [1]: http://jsfiddle.net/r7Hqb/ [2]: http://jsfiddle.net/KooiInc/m2b8Y/embedded