I don't understand why mozilla didn't thoroughly verify the stability of this version. At my workplace, everyone who had updated to Supernova, has attachments problems (doesn't open), If you want to create a local folder, it doesn't create, it shows another sender at the email (even if after you repair it, after two days problem comes back), it has problem with the password, says need to login and enter the new password. Even if you enter the password, doesn;t work. The same email client which worked perfectly until the update to Supernova. For the past week my life has been a living hell trying to reinstall and configure it again. yes, I'm the IT guy for 150pc.