here you can read why I started a new attempt at Newsgroup mozilla.addons.user-experience (on news server news.mozilla.org to get something like an add-on compatibility data base with the help of the SeaMonkey users community.
On the same Wiki page you also will find some “how to use” hints.
I hope I won’t be the only contributer again ;-.)
To avoid misunderstanding: I will leave 10 ratings, and afterwards maximum 20% of all ratings. What means: it’s community’s duty to gain add-on compatibility information for the community.