After updating Firefox I got a message to "refresh" it--that is, remove
all add-ins. Foolishly I did so, thinking to reinstall them later using
But I have not been able to get Video Download Helper to work.
I followed their instructions to install a "companion application." That
means working in a terminal version (actually, Konsole; I'm working in
KDE). The messages I get all say the companion app is ready for use. But
after repeated shutdowns and restarts, VDH still will not download anything.