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Doesn't work with russian search engines (FF23 Portable Russian).
Can't use "Яндекс".

Это отзыв для предыдущей версии этого дополнения (1.0.3.1-signed). 

I'm trying to recreate this bug I can't. Which Russian search engine are you using? I tried Yandex, and when I paste Яндекс into the URL bar for a search, it redirects properly. Can you give me the resulting URL from the search?

This is fixed in 1.0.4.