Xavier Robin – LongTitles
LongTitles is a Firefox extension (up to version 2.0) based on Popup ALT Attributes that fixes Mozilla bugs 45375 and 218223. In versions prior to 3.0, tooltips were truncated if too long. This is especially annoying if the tooltips contain useful information. LongTitles shows the tooltips entirely.
As the bugs are fixed since Firefox 3.0, this extension is not necessary anymore, and can be uninstalled. It is not maintained anymore.
Long Titles is available on Mozilla Addons and below (no automatic updates).