I've installed the Master Password extension, and now I'm trying to update the settings (Auto-Logout, Lock, Prompt etc) However after typing in my first password, and then changing all the settings, I get the message "Unable To Change Master Password". Then when I got back in to the settings none of them have saved. The password has been stored, because when I restart Thunderbird I get a prompt asking for it, and entering in my password works. All I can do is add and remove a master password! Any suggestions? Thanks