GreaseFire Update - Spread the News Rated 2 out of 5 stars
A working updated version of Greasefire:
Above is the most recent working version with latest database.
Listing of other versions, newer ones may appear over time.
The reason for this info is because the regular Greasefire extension on your addons page, won't update anymore, it only shows scripts several years old and nothing newer. Installing the version linked above and pressing Update will fix the problem.
Discussion thread of Greasefire issues by the authors: http://userscripts.org/topics/115646