Rated 4 out of 5 stars

le Ice Wolf ar Beal. 19, 2014 · buan-nasc

Now that FireFox no longer has a status bar, this amazing add-on now doesn't work at all; as the UI for it is completely missing.
There is also no Menu-Option to turn it on via key-press or clicking through.

Until this is fixed, this add-on cannot work on Firefox 29+.

As of at least 2014-05-19.