The fix, below Rated 5 out of 5 stars

See the review "EXTENSION WORKING + DOWNLOAD LINK AND DESCRIPTION" below.
DLd the .xpi file and then drag'n'drop this from your download location to the Add-ons window (open this ia Tools > Add-ons.
Re-start and boo. yah.

This review is for a previous version of the add-on (1.5).