Is this a dead add-on? Rated 1 out of 5 stars

I wonder why this type of add-on has not been updated in 6 years? Firefox is been updated almost every other week, yet we come across these useful add-ons in the database only to not be able to use it.I suggest that Mozilla cleans up the database a little bit, and if an add-on is not updated frequently to match up with Firefox, then it should be removed (it's up to them to decide the time limit)!