Thunderbird’s settings redesign offers a practical case study in information architecture.
Research with 381 users across 42 countries found confusion around appearance-related categories, while many experienced users—particularly on Linux—rely on search.
The team has shared an interactive prototype for exploration and feedback; the earlier assessment of the category list did not test search.
The suggestion was based on a survey of 381 Thunderbird users from 42 countries. About 60% found the appearance settings, although some looked for them in the “Themes” section first. Options for updates and mobile device settings were generally easy to find.
However, the research showed that some sections were confusing. Some users wondered why Calendar and Chat had separate main categories, while basic email settings were in the “Compose” section. Others didn’t see a clear difference between the “Appearance,” “Themes,” and “Add-ons and Themes” options.
The “New Features” section also raised questions: it was unclear whether it would contain notes about what changed in each release or experimental features. Alternative names suggested included “Thunderbird Labs” and “Experimental Features.”
Many experienced users, especially those using Linux, find settings via search rather than browsing through categories. The initial evaluation tested the new organization as a simple list and did not test the search feature. The interactive demo is the next step to evaluate this aspect as well.
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Of those who provided detailed feedback, about 35% were satisfied with the proposed organization. About 20% were concerned about the large number of changes and wanted to preserve existing usage patterns, keep dark mode working reliably, and avoid changes without any real benefit.
The new organization will not unify the application's general settings with the settings of each account. According to the team, this would require much deeper changes to the way Thunderbird is designed.
Some buttons and other controls in the beta version don't work yet. Also, the names don't change depending on whether the user has Linux, Windows, or Mac. Some related improvements have already been incorporated into Thunderbird 160, including changes that replace technical terms with clearer words.
The overall redesign remains under development. The team plans to implement the changes gradually and test each one before releasing it to the testing and stable versions of Thunderbird. The announcement was made on November 10, 2026.
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