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Join UsVersion 53.0beta, first offered to channel users on April 19, 2017
A default startup directory in the address book window can now be configured.
Background images not working and other issues related to embedded images when composing email.
Datetime formatting is not working properly on the Linux 32bit platform. This results in party broken calendar views and incorrect event times - for users on this platform it is strictly recommended to backup the user profile before updating and disable Lightning after updating for the remaining lifetime of this version to avoid damages to calendar data.
Large attachments may not be shown or saved correctly if the message is stored in an IMAP folder which is not synchronized for offline use. Workaround: Set preference browser.cache.memory.max_entry_size to the value of -1 (unlimited) and create integer preference browser.cache.memory.capacity with the value of 200000 (200 MB, 25 MB per message).
Crash due to incompatibility with McAfee Anti-SPAM add-on. Workaround: Start in safe mode and disable McAfee Anti-Spam Extension.
Crash when compacting IMAP folder.