Yandex Evolution by Savevur

Addon provides search engine by Yandex (Яndex, Яндекс) and changes design of Yandex sites:
ya.ru
yandex.ru
yandex.by
yandex.kz
yandex.eu
yandex.com
yandex.com.tr

You can use it:
1) in search bar
2) in address bar with 0 (Zero) or Я (Cyrillic) or Z prefix

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Icon templates from source:
Flaticon.com
icons8.com

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My other addons, maybe you find them useful:
https://addons.mozilla.org/en-US/firefox/user/16521499/