Beta Notes

Mark all folders of an account as read

Experimental feature: Language packs can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false)

ADD-ON SUPPORT: Restartless add-ons continue to work if their authors have made the necessary minor adjustments. Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them, and Lightning/Calendar is the only one we know that has been adapted.

Add-on overlays now loaded with Thunderbird's own overlay loader

Improved phishing attempt detection for messages with certain forms

The stand-alone options window has been removed, all options are now shown in a tab

Thunderbird hung if HTML signature references non-existent image

Filters not working for headers that appear more than once

mbox to maildir conversion not working if Windows search integration is enabled

Links in the Add-on Manager's search results and theme browsing tabs open in external browser

Localized versions of Thunderbird didn't show a localized name for the "Drafts" and "Sent" folders for certain IMAP providers (particularly in France)

Replying to a message with an empty subject inserted Re: twice

Double-clicking on a word in the Write window sometimes launches the Advanced Property Editor or Link Properties dialog

Spellcheck marks disappeared erroneously for words with an apostrophe (is working in Thunderbird 60 ESR)

Chat: Twitter not working due to API changes at Twitter.com (solution forthcoming)