Notsureifserious.jpg
These "too many changes" are not just for the sake of it, they are there to improve performance, security, features etc.
Plus the performance jump from 3 to 10 is massive!
As for addons, what addons would you be loosing? All addons should be compatible now with FF 10 (unless they're not very popular ones that never get updated) and if not just use this method that mrk posted many times before:
http://forums.overclockers.co.uk/showpost.php?p=20508066&postcount=38
And if that doesn't work, I am sure that there would be alternatives, perhaps even better ones out there somewhere.
Anyway, waterfox 10 seems pretty damn good so far, feels even snappier and quicker overall than the previous version!
Memory usage is around 400MB (been opened for about 30 min), that's with 5 tabs opened, 8 addons and 4 user styles installed.