91.4.0 "candidate" is being made available early to get wider testing. Having many users like yourself try it before it ships next week will help ensure the following fixes are proved to be helpful:
* Resolve high memory usage and performance issue caused by language packs
* Printing multiple messages at once
* Improve IMAP startup performance for accounts with a multitude of folders (this has been in beta for many weeks)
Please report all bugs https://bugzilla.mozilla.org/enter_bug. ... test91.4.0
Thank you for participating.