since one of firefox greatnesses is the vast addons number it has, i think many users need (like me) an easy certain way to tell if the next version you're about to upgrade will break come of your addons. yes, i've tried "is it compatibile" addon, and found it not reliable, unfortunately (right now on my ff 10.x esr it reports "update scanner" and "firebug" compatibile 5.0-14.0, both... i thought i would prefer a list so i struggled a bit more and also found this page https://addons.mozilla.org/en-US/firefox/compatibility that at first seems a perfect way to easly check addons compatibility, also because you can set a specific ff versions, perfect! but... 1) really can't understand what are the meaning of those "95% of this and that" and what usefulness, apart from statistics useful just to internal developers, that could have with addons users 2) can't understand why its 500+ pages list is not searchable, sortable, categoryzable, filtrable nothing, you have to browse hundreds of pages... apparently sorted in "users using this addon" count, descending what would really make addons users (so all ff users) happy is a page similar to that but with some way for users to sort, restrict, search the list to have a fast and easy to understand way to check their addons compatibility, once and for all, and also for different ff versions, somethng that coul easily say "yes" or "no". If such a page could be incorporated in the ff addon config window in some way, it would be perfect. It is similar to what "it is compatible" addon should probably do, perhaps, but it would be much much clearer and because of that, better. And, if one could find there also some alternatives suggested when an addon is not compatible, that would be ideal, really. i'm postponing my 10.x esr to 17.x esr upgrade since weeks, just because i use many addons for my work and i don't wont to miss some critical addons. iìm pretty sure may users would love this. don't take this as a harsh comment i love mozilla just for existing, i just want it to be closer to perfect :-D cheers Marco