The Kashubian localization team has retired from the project. We've been unable to find new contributors to take it over and ensure it remains up-to-date. We're ending Firefox builds for Kashubian as of Firefox 34 and removing Kashubian from mozilla.org and from public downloads. Users will be notified of the change and directed to the Firefox download page to find another localization to use. Should anyone come to revive the localization, the repos will remain in place, allowing them to pick up where the previous team left off instead of starting from the beginning.