Add keywords to your search in Firefox
Go to any Search page (e.g. “http://lingvo.yandex.ru/en”), right-click the search box and select “Add keywords for this search”.
Enter the search description, e.g. “Lingvo translation” and a keyword, e.g. “tranzl”.
Good job! From now you can just click Alt+D to go to Firefox location bar, type “tranzl something” and you’ll get the translation for “something”.