I was very happy with "The Addon Bar (Restored)" until it stopped working in Firefox versions 55 & 56.
Today I have found an extension that is better than "The Addon Bar (Restored). It's called "Status-4-Evar". It is compatible with FF 55.0.3; and it restores the TRUE status bar that predated the "Add-on bar" and offered so much more info and flexibility than the so-called "add-on bar".
I haven't tested it in Firefox 56.0, because, frankly, FF 56.0 is pure junk! With FF 55.0.3, Mozilla finally was getting back to being the outstanding browser that I came to love and depend upon, fixing some of the bugs that were in FF 55.0. I was hopeful that Firefox 56.0 would be even better; but it is probably the worst browser I've seen in years for hanging, freezing, crashing, and sucking memory dry of all of the browsers ever. So, until Mozilla corrects the myriad of bugs in FF 56.0, I will stay with version 55.0.3 -- and my new favorite extension that restores the status bar to what it should be--a status bar.
Goodbye, Geek-in-Training. I wish you well.
For those who want an actual status bar rather than a makeshift substitute, I recommend "Status-4-Evar", available at: