Some folks like to see messages on their Status Bar. Some don't. Some programmers cover all the bases by including Tool Tips and Status Bar messages in their A tags. Some don't. Some abuse the daylights out of it (eg, scrolling blinkers) which is likely why FF resorted to putting it under User control; where it should be.
Ethical issues aside, don't worry about it. The link text should be clear enough; the additional text in the Tool Tips and Status Bar message should only expand upon that.
For example, if the link text reads 'Home' then the Tool Tip and Status Bar (as you like) should read something like 'Click here to return to Home page.'
The side benefit is that some 'screen readers' for the sight impaired are able to use the additional text in the A tag (although once again everyone seems to have gone their own way on this so, again, covering all the bases seems prudent).