Firefox just gets worse and worse with time. All the good addons breaks and are not replaced with anything in Firefox. A feature like always being able to see the actual URL adress of links on the fly is an absolute necessity in my opinion. Take for example links in mails, to quickly determine with safety that it is not a scam link leading you to a fishing site we could, with the help of this addon, just hover over the link and see what the URL was, and if not legit then not click it. There's no easy way to do this in firefox without this addon.
It saddens me to say it but I believe my Firefox using days are coming to an end. Mozilla seems hell bent on scaring off quality conscious users.