Thunderbird tries to restore all open windows upon start. This is damn stupid. Because if a person clicks on an entry in Thunderbird, for instance an eMail or folder, and does NOT wait until this item opens up (it may take longer than usual, maybe because of complex content or another job bogging down the computer, like a virus scan or update) in a window but thinks that the click was not recognized and continues by clicking on other items, it may issue 100 or more open commands to an already overloded Thunderbird. It takes forever to open all the windows, to the person decides to terminate the windows session. The next time he/she opens Thunderbird, it tries to open all the windows, and seems do be locked. If we wait long enough, Thunderbird will crash because too many windows are open and the memory is getting low, or some internal limit is reached. It is a bug, that Thunderbird recognizes click to open windows, despite the first one is not open. It is also a bug, that Thunderbird tries to open all windows upon start that seem to be open the last time. And it is certainly a bug, that Thunderbird crashes if too many windows are in the to open list. Please fix them. No, it does not help, that there may be a special startup that does not open all recent windows, because a person that is struck by slowly opening windows on a slow computer is neither capable of issuing a special way to open Thunderbird, nor he does know that the problem is based upoj the many windows that should be open - he simply sees an slowly and than crashing Thunderbird.