Welcome. I have a problem with Thunderbird. I updated to the latest version, and since then the bird starts very slowly. When you click the screen goes white and about 8-10 seconds later appears in the menu. The only thing I found in the messages: Czas: 2014-12-25 20:58:11 Ostrzeżenie: mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create Plik źródłowy: resource://gre/components/steelApplication.js Wiersz: 783 The problem arose after the update. Removal and re-installation, unfortunately, it does not solve.