Anderson tried to address those complaints as well.

"Both Yandex and Google are public companies and it is not always possible to share in detail the arrangements and discussions between the parties," Anderson said. "Given these constraints, we did not deem it possible to socialize this with the community in advance as we might normally do. This is an unfortunate reality that we are bound by despite our goal to collaborate with the community as transparently as possible."

Russian users of Firefox 14 and later can change the default Google to another search engine, including Yandex, by accessing the list in the search bar.

Both Anderson and Isaev said that Yandex would continue to develop a customized version of Firefox that sets its own search engine as the default.

worldwide to version 13 last week. Windows, Mac and Linux editions of can be downloaded manually from Mozilla's site, while current users will be offered the upgrade through the browser's own update mechanism.