New in Mozilla Thunderbird 52.0
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This article describes the major changes that appear to users in Thunderbird version 52.0. Full details of all the changes can be found in Thunderbird 52.0. release notes.
Compared to Thunderbird version 45.0, this is a very less visible change in user interface, but instead, many long bugs and annoyances were fixed.
The most important change is how to include images in a composition window. The images are now included in the form of a URI, not as a reference to other messages or parts of operating system files. This allows better interoperability with office packages such as MS Office or LibreOffice. It fixes problems for long in attaching pictures to other messages. Images related to locations on the Internet will no longer be downloaded and will be automatically attached to the message. It can be transformed individually through image properties dialogue for each image or changing it globally by setting priority email.compose.attach_http_images
Since the data URI originally appears in the raw binary data user interface, it is now a small and inserts HTML dialogue in the Image Properties dialogue, for example:
When pasting images that reference operating system files into the compose window, the image will now be blocked and a notification will be displayed:
This is to protect users from inadvertently disclosing files.
Main Message Window – Folder Pane
The folder pane now has a Folder Pane Toolbar on the top which comes preconfigured with the Folder Views switcher. The Folder Pane Toolbar can be enabled through the View menu > Toolbars.
Main Window – Thread Pane
The Correspondents column with new icons is now the default for all new folders. There is no forced conversion. This can be switched off with the preference mail.threadpane.use_correspondents.
Calendar – Lightning – Event in a Tab
Events can now be created and edited in a tab. To enable this option, select Options > Calendar > General tab.in the Tools menu >