New:
- GMail supports OAuth2 authentication, removing the need to manually select “allow less secure applications” in Google options for the account
- Ship Lightning calendar addon with Thunderbird and enable with an opt-out dialog
- Filter sent messages
- Filter messages when archived
- Enable search in multiple/all address books
- Add support for Yahoo Messenger in Chat
- Support Internationalized domain name URLs for RSS feeds
- Show expanded columns in folder pane
- Allow file-per-message (maildir) local message storage
- Add a Learn more link to the support page in feeds subscribe dialog
- Add reading position marker line to conversations
- The editor for twitter should show inputtable character count
Changed:
- Thunderbird will no longer use SHA-1 to sign messages
- Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on some servers
- Make OpenSearch queries open in the user’s default browser
- Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates
Fixed:
- Replied/forwarded icons disappear after folder repair, detach/delete
- Attachment “Save As” files are displayed in Tools/Saved Files
- Adding unknown email addresses to Mailing list, then deleting ghost duplicate entries from contacts pane, caused dataloss in mailing list
- Web site from RSS feed was not rendered correctly
- Email address with leading/trailing whitespace displayed wrongly with added quotes when composing [“foo”@bar.com]
- Force display of Sender header if S/MIME sender is the signer
- Addressing autocomplete widget: Typed text in red despite results/matches found if suggestions change by last input
- Status bar not accessible
- Wrong folder may be deleted when requesting junk delete
- Severe UI stutter or freezes getting new mail for very large folders
- Automatically rejoin multi-user conversations on reconnect for XMPP
- Various improvements when using IRC on moznet
- Significantly improve XMPP support
- Fixes for connecting to non-standard IRC networks
- Automatically reclaim IRC nicks during a reconnect
- Changing location in editor doesn’t preserve the font when returning to end of text/line
- Inline spell checker loses red underlines after a backspace is used