Rated 4 out of 5 stars

Download status 1.5.5 working perfectly well here, tracks regular downloads as well as DTA downloads with no problem.
I noticed however a slight compatibility issue with one extension here, 'Organize Status Bar 1.6.4' ONLY under following condition:
When all 3 files -- extensions.ini, extensions.log, extensions.rdf -- have been deleted (deleted for the purpose of cleaning "extensions' database" but recreated by Firefox on next start), then the extension 'Organize Status Bar 1.6.4' is dismantled, but installing it again repairs it ...
Otherwise, running smooth.

This review is for a previous version of the add-on (1.5.5).