>>дружелюбность интерфейса
>
>tabmix+, all-in-one sidebar
>>полезность для пользователя
>
>noscript, flashgot, greasemonkey и adblock Хорошо, условия конкурса Вы так и не прочитали... Может кто-то другой прочитает:
Contest Details
Extend Firefox 3.5 is a developer contest to encourage development and innovation in Web experience through add-ons to Firefox 3.5.
All entries will be judged by a panel of experts, with prizes awarded for entries that make use of new capabilities being introduced in Firefox 3.5 and that demonstrate excellence in user experience, innovativeness, and use of open standards.
Prizes will also be awarded to existing Firefox Add-ons that are updated for Firefox 3.5, and that show significant improvements in user experience and performance.