[exodust]

I would not choose to have a tooltip link hover, but you should be allowed to have it if you want. Via options, about:config, or possible via an extension.

In UI terms, the concept of a fixed footer is well established. We see it often on sites and applications. FF allows adjustment of the millisecond delay of the link text, but no control over other properties of that element. I don't get the logic. When vendors move the furniture around in their "security updates" it makes me distrust the updates, particularly when the furniture can't be moved back to how it looked before.