As promised I have just released the update that fixes the problem with the Mozilla automatic update manager. The problem was that when you switched to a locale that was not available as a translation of your Mozilla application (Firefox/Thunderbird), then the update manager was unable to find any updates for you. This probably happened in quite a lot of cases cause for example the QLS by default only allows youo to switch to e.g. de-AT or de-DE, but for Firefox and Thunderbird only a de translation is available (same goes for fr-FR, it-IT, and some other major languages, but not for e.g. en-US, or zh-CN). The update fixes this problem, so if you will probably all receive an “Update available” message from your Mozilla application pretty soon.