Bewertet mit 1 von 5 Sternen
It WAS one of my favorite Add-on's, but v1.7.1 doesn't work anymore with Firefox v55+.
You can find a similar, but still working Add-on here:
It works for me on 55.0.3 (32bit) together with Add-on "New Add-on Bar" here:
Hope it does it also 4U!