The "Thunderbird91" corresponding to Apple M1 officially opens the new version of the v78 system.

Default enable of multiple processes (E10s) and mail response to "redirection", etc.

　The latest version of the open source mail software Thunderbird, Thunderbird 91.0, was officially released on Aug. 11 (US time). In the mainstream version upgrade from the "Thunderbird78" system, in addition to being based on the "Firefox91" foundation, many new features have been introduced.

　Note that automatic updates from "Thunderbird78" to "Thunderbird91" have not been provided. "to use Thunderbird91, you need to download the installer from thunderbird.net and install it manually, please note.

Multiprocess (E10s) mode

　The highlight of "Thunderbird91" is the action in standard multi-process (E10s) mode. This was adopted a long time ago in "Firefox", but "Thunderbird" was finally adopted by the standard.

Mozilla released the roadmap of multi-process technology "E10s" introducing Firefox48.

　"E10s" divides the previous single "Thunderbird" process into multiple. Even if part of the application crashes, there will be no other impact, so stability can be expected to improve. In addition, it is expected to improve responsiveness and enhance security.

Improvement of E-mail function

　In the case related to the interface, a variety of improvements have also been made, such as adding accessories to the screen to become new. As the main change point, you can list the points that can display empty CC/BCC lines in the email production screen, newly set keyboard shortcuts for accessing To/CC/BCC fields, support for non-ASCII characters in the recipient's address, and so on.

　In addition, the redirection of messages is imported as a new feature. This is very similar to transmission, except that it is not sent through itself (the repeater), but directly from the original sender. The message created by the redirect does not add the "Fwd:" prefix to the title, nor does it change the body. Because the original sender is set in the reply destination (Reply-To), when the receiver returns, the message is delivered directly to the original sender, not to himself. This command can be used from the menu at the right end of the message toolbar.

　In addition, the ability to reply to e-mail addresses that may not exist, such as "noreply@example.com", and the ability to warn when the number of message recipients exceeds the threshold has been added. In particular, the latter will help prevent the disclosure of customers'e-mail addresses. In addition, an integrated "PDF.js" viewer allows you to preview PDF files in "Thunderbird". It also enhances responses to "OpenPGP" and "CardDAV" as well as calendar capabilities.

Changes in system requirements

　In "Thunderbird 91", Mac devices installed on Apple's Silicon are locally supported. The speed of M1 chip can be expected to improve.

　In addition, the new system requirements are as follows. Support for OS X Mavericks (10.9), Yosemite (10.10), El Capitan (10.11) has been suspended, please note.

Safety-related corrections

　There are 9 security issues modified in "Thunderbird 91.0" based on the CVE number. The details of the severity are that, according to Mozilla standards, there are six "High" in the second of the four stages, two in the third "Moderate" from above, and one in the lowest "Low". "Thunderbird" JavaScript is not valid in the initial setup, so the risk is not as high as "Firefox", but it also solves the problem of arbitrary code execution, hoping to deal with it as soon as possible.