4.0.0-beta.1.rc: 2026-06-07

4.0.0-beta.1.rc: 2026-06-07

Note

WIP Notice: This is a heavily work-in-progress upcoming version of Mastodon Bird UI, part of the ongoing major rewrite (see issue #172).
💀 Compatibility: Mastodon v4.6.0-beta.1, built from Mastodon main after 2026-06-07. This release brings Bird UI styling for the now-live Collections feature.

For older Mastodon servers, use 4.0.0-alpha.8.rc2 (2026-05-24) or an earlier dated release.

This release brings Bird UI styling for the newly-shipped Collections feature in Mastodon, plus a couple of navigation polish items on top of rc2.

What changed

Collections feature support

Mastodon's Collections feature shipped in v4.6.0-beta.1. Bird UI now styles the related UI:

• Collections side navigation icon renders again (it was being hidden by Bird UI's broad column-link icon-path reset).
• "Follows you" badge inside account list items (collections lists, follower lists, etc.) uses the same dark pill styling we already use in profile headers.
• Verified link badge inside account list items mirrors the existing profile field verified-link style: Bird UI's tick icon and accent link color in place of the green gradient SVG.
• All badges in account list items drop the core 4px padding so they sit flush in the row.

Navigation polish

• Notifications now sits in the second slot of the side navigation menu, right after Home.
• Trends heading no longer renders a stray bottom border.

Impact by install method

Custom CSS users (paste CSS into Mastodon admin)

The compiled dist/mastodon-bird-ui.css ships updated. Re-paste it into Mastodon admin Custom CSS after upgrading your Mastodon server to a build from 2026-06-07 or later.

Mastodon admins running install-to-mastodon.sh

git pull the Bird UI clone, re-run the install script, and recompile assets. No themes.yml changes since rc2.

Heads up for mementomori-social/mastodon fork users

Bird UI is now styled for the Collections feature shipped in Mastodon v4.6.0-beta.1. Pull the fork branch and recompile: https://github.com/mementomori-social/mastodon/tree/mementomods-2026-06-07

Changelog

• Tighten badge spacing in account list items (override core padding on all badges, nudge Follows you down)
• Style the verified link badge in account list items (e.g. collections) the same as profile field verified links
• Style the Follows you badge in account list items (e.g. collections) the same as in profiles
• Show the Collections nav icon (was hidden by the column-link icon path reset)
• Move Notifications to the second slot in the navigation menu
• Remove border-bottom from the trends heading