Thunderbird 136.0, a community-driven email client based on Mozilla technologies, has been officially released. This version is built on the Firefox 136 codebase and represents an intermediate release, with updates scheduled to be delivered prior to the next major version. Additionally, Thunderbird 128.8.0 has become available in the Extended Support Release (ESR) branch, which offers long-term support and receives updates throughout the year.
The launch of Thunderbird 136.0 marks a shift in the project's release strategy. In addition to annual major releases tied to Firefox ESR branches, monthly major releases will now align with standard Firefox updates. Previously, builds based on stable non-ESR Firefox releases were noted as experimental, featured warnings in their release notes, and were not prominently listed on the download page.
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Thunderbird 136.0 removes this testing-only label, making it the default release for users. The development and maintenance of Thunderbird ESR branches will continue unchanged.
This new approach accelerates feature delivery, smooths transitions between versions by distributing changes over time, and expands the scope of bug fixes included in each update. Notably, the ESR branch remains focused on addressing vulnerabilities and critical issues.
Key enhancements in Thunderbird 136
- Enhanced dark mode functionality with the introduction of the
mail.dark-reader.enabledsetting. This feature integrates the Dark Reader add-on into the message panel, automatically applying a dark theme to messages with light backgrounds. - A new global setting that allows users to control sorting and threaded message display modes across all Thunderbird components.
- The addition of message filter management capabilities to the context menu within the mail folder list panel.
- The inclusion of the
mail.threadpane.table.horizontal_scrollsettingthat enables horizontal scrolling support in the message list. - An option in the calendar scheduler setup wizard to select or deselect all calendars simultaneously.
You get the app from here: https://www.thunderbird.net/en-US/thunderbird/136.0/releasenotes/
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