Reading comments in https://bugzilla.mozilla.org/show_bug.cgi?id=732812 I've found that the workaround for this bug is to close thunderbird with Ctrl+Q - this saves window maximized state.
Reading comments in https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=732812 I've found that the workaround for this bug is to close thunderbird with Ctrl+Q - this saves window maximized state.