Added
- Add link for adding a user to a list from their profile ([namelessGonbai](https://github.com/mastodon/mastodon/pull/9062))
- Add joining several hashtags in a single column ([gdpelican](https://github.com/mastodon/mastodon/pull/8904))
- Add volume sliders for videos ([sumdog](https://github.com/mastodon/mastodon/pull/9366))
- Add a tooltip explaining what a locked account is ([pawelngei](https://github.com/mastodon/mastodon/pull/9403))
- Add preloaded cache for common JSON-LD contexts ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9412))
- Add profile directory ([Gargron](https://github.com/mastodon/mastodon/pull/9427))
- Add setting to not group reblogs in home feed ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9248))
- Add admin ability to remove a user's header image ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9495))
- Add account hashtags to ActivityPub actor JSON ([Gargron](https://github.com/mastodon/mastodon/pull/9450))
- Add error message for avatar image that's too large ([sumdog](https://github.com/mastodon/mastodon/pull/9518))
- Add notification quick-filter bar ([pawelngei](https://github.com/mastodon/mastodon/pull/9399))
- Add new first-time tutorial ([Gargron](https://github.com/mastodon/mastodon/pull/9531))
- Add moderation warnings ([Gargron](https://github.com/mastodon/mastodon/pull/9519))
- Add emoji codepoint mappings for v11.0 ([Gargron](https://github.com/mastodon/mastodon/pull/9618))
- Add REST API for creating an account ([Gargron](https://github.com/mastodon/mastodon/pull/9572))
- Add support for Malayalam in language filter ([tachyons](https://github.com/mastodon/mastodon/pull/9624))
- Add exclude_reblogs option to account statuses API ([Gargron](https://github.com/mastodon/mastodon/pull/9640))
- Add local followers page to admin account UI ([chr-1x](https://github.com/mastodon/mastodon/pull/9610))
- Add healthcheck commands to docker-compose.yml ([BenLubar](https://github.com/mastodon/mastodon/pull/9143))
- Add handler for Move activity to migrate followers ([Gargron](https://github.com/mastodon/mastodon/pull/9629))
- Add CSV export for lists and domain blocks ([Gargron](https://github.com/mastodon/mastodon/pull/9677))
- Add `tootctl accounts follow ACCT` ([Gargron](https://github.com/mastodon/mastodon/pull/9414))
- Add scheduled statuses ([Gargron](https://github.com/mastodon/mastodon/pull/9706))
- Add immutable caching for S3 objects ([nolanlawson](https://github.com/mastodon/mastodon/pull/9722))
- Add cache to custom emojis API ([Gargron](https://github.com/mastodon/mastodon/pull/9732))
- Add preview cards to non-detailed statuses on public pages ([Gargron](https://github.com/mastodon/mastodon/pull/9714))
- Add `mod` and `moderator` to list of default reserved usernames ([Gargron](https://github.com/mastodon/mastodon/pull/9713))
- Add quick links to the admin interface in the web UI ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/8545))
- Add `tootctl domains crawl` ([Gargron](https://github.com/mastodon/mastodon/pull/9809))
- Add attachment list fallback to public pages ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9780))
- Add `tootctl --version` ([Gargron](https://github.com/mastodon/mastodon/pull/9835))
- Add information about how to opt-in to the directory on the directory ([Gargron](https://github.com/mastodon/mastodon/pull/9834))
- Add timeouts for S3 ([Gargron](https://github.com/mastodon/mastodon/pull/9842))
- Add support for non-public reblogs from ActivityPub ([Gargron](https://github.com/mastodon/mastodon/pull/9841))
- Add sending of `Reject` activity when sending a `Block` activity ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9811))
Changed
- Temporarily pause timeline if mouse moved recently ([lmorchard](https://github.com/mastodon/mastodon/pull/9200))
- Change the password form order ([mayaeh](https://github.com/mastodon/mastodon/pull/9267))
- Redesign admin UI for accounts ([Gargron](https://github.com/mastodon/mastodon/pull/9340), [Gargron](https://github.com/mastodon/mastodon/pull/9643))
- Redesign admin UI for instances/domain blocks ([Gargron](https://github.com/mastodon/mastodon/pull/9645))
- Swap avatar and header input fields in profile page ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9271))
- When posting in mobile mode, go back to previous history location ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9502))
- Split out is_changing_upload from is_submitting ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9536))
- Back to the getting-started when pins the timeline. ([kedamaDQ](https://github.com/mastodon/mastodon/pull/9561))
- Allow unauthenticated REST API access to GET /api/v1/accounts/:id/statuses ([Gargron](https://github.com/mastodon/mastodon/pull/9573))
- Limit maximum visibility of local silenced users to unlisted ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9583))
- Change API error message for unconfirmed accounts ([noellabo](https://github.com/mastodon/mastodon/pull/9625))
- Change the icon to "reply-all" when it's a reply to other accounts ([mayaeh](https://github.com/mastodon/mastodon/pull/9378))
- Do not ignore federated reports targeting already-reported accounts ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9534))
- Upgrade default Ruby version to 2.6.0 ([Gargron](https://github.com/mastodon/mastodon/pull/9688))
- Change e-mail digest frequency ([Gargron](https://github.com/mastodon/mastodon/pull/9689))
- Change Docker images for Tor support in docker-compose.yml ([Sir-Boops](https://github.com/mastodon/mastodon/pull/9438))
- Display fallback link card thumbnail when none is given ([Gargron](https://github.com/mastodon/mastodon/pull/9715))
- Change account bio length validation to ignore mention domains and URLs ([Gargron](https://github.com/mastodon/mastodon/pull/9717))
- Use configured contact user for "anonymous" federation activities ([yukimochi](https://github.com/mastodon/mastodon/pull/9661))
- Change remote interaction dialog to use specific actions instead of generic "interact" ([Gargron](https://github.com/mastodon/mastodon/pull/9743))
- Always re-fetch public key when signature verification fails to support blind key rotation ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9667))
- Make replies to boosts impossible, connect reply to original status instead ([valerauko](https://github.com/mastodon/mastodon/pull/9129))
- Change e-mail MX validation to check both A and MX records against blacklist ([Gargron](https://github.com/mastodon/mastodon/pull/9489))
- Hide floating action button on search and getting started pages ([tmm576](https://github.com/mastodon/mastodon/pull/9826))
- Redesign public hashtag page to use a masonry layout ([Gargron](https://github.com/mastodon/mastodon/pull/9822))
- Use `summary` as summary instead of content warning for converted ActivityPub objects ([Gargron](https://github.com/mastodon/mastodon/pull/9823))
- Display a double reply arrow on public pages for toots that are replies ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9808))
- Change admin UI right panel size to be wider ([Kjwon15](https://github.com/mastodon/mastodon/pull/9768))
Removed
- Remove links to bridge.joinmastodon.org (non-functional) ([Gargron](https://github.com/mastodon/mastodon/pull/9608))
- Remove LD-Signatures from activities that do not need them ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9659))
Fixed
- Remove unused computation of reblog references from updateTimeline ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9244))
- Fix loaded embeds resetting if a status arrives from API again ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9270))
- Fix race condition causing shallow status with only a "favourited" attribute ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9272))
- Remove intermediary arrays when creating hash maps from results ([Gargron](https://github.com/mastodon/mastodon/pull/9291))
- Extract counters from accounts table to account_stats table to improve performance ([Gargron](https://github.com/mastodon/mastodon/pull/9295))
- Change identities id column to a bigint ([Gargron](https://github.com/mastodon/mastodon/pull/9371))
- Fix conversations API pagination ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9407))
- Improve account suspension speed and completeness ([Gargron](https://github.com/mastodon/mastodon/pull/9290))
- Fix thread depth computation in statuses_controller ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9426))
- Fix database deadlocks by moving account stats update outside transaction ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9437))
- Escape HTML in profile name preview in profile settings ([pawelngei](https://github.com/mastodon/mastodon/pull/9446))
- Use same CORS policy for /:username and /users/:username ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9485))
- Make custom emoji domains case insensitive ([Esteth](https://github.com/mastodon/mastodon/pull/9474))
- Various fixes to scrollable lists and media gallery ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9501))
- Fix bootsnap cache directory being declared relatively ([Gargron](https://github.com/mastodon/mastodon/pull/9511))
- Fix timeline pagination in the web UI ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9516))
- Fix padding on dropdown elements in preferences ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9517))
- Make avatar and headers respect GIF autoplay settings ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9515))
- Do no retry Web Push workers if the server returns a 4xx response ([Gargron](https://github.com/mastodon/mastodon/pull/9434))
- Minor scrollable list fixes ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9551))
- Ignore low-confidence CharlockHolmes guesses when parsing link cards ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9510))
- Fix `tootctl accounts rotate` not updating public keys ([Gargron](https://github.com/mastodon/mastodon/pull/9556))
- Fix CSP / X-Frame-Options for media players ([jomo](https://github.com/mastodon/mastodon/pull/9558))
- Fix unnecessary loadMore calls when the end of a timeline has been reached ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9581))
- Skip mailer job retries when a record no longer exists ([Gargron](https://github.com/mastodon/mastodon/pull/9590))
- Fix composer not getting focus after reply confirmation dialog ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9602))
- Fix signature verification stoplight triggering on non-timeout errors ([Gargron](https://github.com/mastodon/mastodon/pull/9617))
- Fix ThreadResolveWorker getting queued with invalid URLs ([Gargron](https://github.com/mastodon/mastodon/pull/9628))
- Fix crash when clearing uninitialized timeline ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9662))
- Avoid duplicate work by merging ReplyDistributionWorker into DistributionWorker ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9660))
- Skip full text search if it fails, instead of erroring out completely ([Kjwon15](https://github.com/mastodon/mastodon/pull/9654))
- Fix profile metadata links not verifying correctly sometimes ([shrft](https://github.com/mastodon/mastodon/pull/9673))
- Ensure blocked user unfollows blocker if Block/Undo-Block activities are processed out of order ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9687))
- Fix unreadable text color in report modal for some statuses ([Gargron](https://github.com/mastodon/mastodon/pull/9716))
- Stop GIFV timeline preview explicitly when it's opened in modal ([kedamaDQ](https://github.com/mastodon/mastodon/pull/9749))
- Fix scrollbar width compensation ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9824))
- Fix race conditions when processing deleted toots ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9815))
- Fix SSO issues on WebKit browsers by disabling Same-Site cookie again ([moritzheiber](https://github.com/mastodon/mastodon/pull/9819))
- Fix empty OEmbed error ([renatolond](https://github.com/mastodon/mastodon/pull/9807))
- Fix drag & drop modal not disappearing sometimes ([hinaloe](https://github.com/mastodon/mastodon/pull/9797))
- Fix statuses with content warnings being displayed in web push notifications sometimes ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9778))
- Fix scroll-to-detailed status not working on public pages ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9773))
- Fix media modal loading indicator ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9771))
- Fix hashtag search results not having a permalink fallback in web UI ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9810))
- Fix slightly cropped font on settings page dropdowns when using system font ([ariasuni](https://github.com/mastodon/mastodon/pull/9839))
- Fix not being able to drag & drop text into forms ([tmm576](https://github.com/mastodon/mastodon/pull/9840))
Security
- Sanitize and sandbox toot embeds in web UI ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9552))
- Add tombstones for remote statuses to prevent replay attacks ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/9830))