I used to use Reminderfox with Firefox, to remind me of anniversaries, appointments etc. Then it became incompatible with FF (or rather, the other way around), but was still useable with T'bird. But now I see it's suddenly become incompatible with T'bird, and all my dates have disappeared! Disaster! My life is about to descend into chaos!
I see on the 'net that one suggestion is to import the reminderfox.ics file into Lightning, the T'bird calendar. I've located the .ics file, but how do I import it into Lightening? If that doesn't work, are there any other suggestions?