- Add option to overwrite imported data instead of merging ([Gargron](https://github.com/tootsuite/mastodon/pull/9962))
- Add featured hashtags to profiles ([Gargron](https://github.com/tootsuite/mastodon/pull/9755), [Gargron](https://github.com/tootsuite/mastodon/pull/10167), [Gargron](https://github.com/tootsuite/mastodon/pull/10249), [ThibG](https://github.com/tootsuite/mastodon/pull/10034))
- Add indication when you are not allowed to follow an account in web UI ([Gargron](https://github.com/tootsuite/mastodon/pull/10420), [Gargron](https://github.com/tootsuite/mastodon/pull/10491))
- Add validations to admin settings to catch common mistakes ([Gargron](https://github.com/tootsuite/mastodon/pull/10348), [ThibG](https://github.com/tootsuite/mastodon/pull/10354))
- Add `type`, `limit`, `offset`, `min_id`, `max_id`, `account_id` to search API ([Gargron](https://github.com/tootsuite/mastodon/pull/10091))
- Add a preferences API so apps can share basic behaviours ([Gargron](https://github.com/tootsuite/mastodon/pull/10109))
- Add `visibility` param to reblog REST API ([Gargron](https://github.com/tootsuite/mastodon/pull/9851), [ThibG](https://github.com/tootsuite/mastodon/pull/10302))
- Add `allowfullscreen` attribute to OEmbed iframe ([rinsuki](https://github.com/tootsuite/mastodon/pull/10370))
- Add `blocked_by` relationship to the REST API ([Gargron](https://github.com/tootsuite/mastodon/pull/10373))
- Add `tootctl statuses remove` to sweep unreferenced statuses ([Gargron](https://github.com/tootsuite/mastodon/pull/10063))
- Add `tootctl self-destruct` to shut down server gracefully ([Gargron](https://github.com/tootsuite/mastodon/pull/10367))
- Add option to hide application used to toot ([ThibG](https://github.com/tootsuite/mastodon/pull/9897), [rinsuki](https://github.com/tootsuite/mastodon/pull/9994), [hinaloe](https://github.com/tootsuite/mastodon/pull/10086))
- Change design of profile column in web UI ([Gargron](https://github.com/tootsuite/mastodon/pull/10337), [Aditoo17](https://github.com/tootsuite/mastodon/pull/10387), [ThibG](https://github.com/tootsuite/mastodon/pull/10390), [mayaeh](https://github.com/tootsuite/mastodon/pull/10379), [ThibG](https://github.com/tootsuite/mastodon/pull/10411))
- Change language detector threshold from 140 characters to 4 words ([Gargron](https://github.com/tootsuite/mastodon/pull/10376))
- Change language detector to always kick in for non-latin alphabets ([Gargron](https://github.com/tootsuite/mastodon/pull/10276))
- Change icons of features on admin dashboard ([Gargron](https://github.com/tootsuite/mastodon/pull/10366))
- Change DNS timeouts from 1s to 5s ([ThibG](https://github.com/tootsuite/mastodon/pull/10238))
- Change Docker image to use Ubuntu with jemalloc ([Sir-Boops](https://github.com/tootsuite/mastodon/pull/10100), [BenLubar](https://github.com/tootsuite/mastodon/pull/10212))
- Change public pages to be cacheable by proxies ([BenLubar](https://github.com/tootsuite/mastodon/pull/9059))
- Change the 410 gone response for suspended accounts to be cacheable by proxies ([ThibG](https://github.com/tootsuite/mastodon/pull/10339))
- Change web UI to not not empty timeline of blocked users on block ([ThibG](https://github.com/tootsuite/mastodon/pull/10359))
- Change JSON serializer to remove unused `@context` values ([Gargron](https://github.com/tootsuite/mastodon/pull/10378))
- Change GIFV file size limit to be the same as for other videos ([rinsuki](https://github.com/tootsuite/mastodon/pull/9924))
- Change Webpack to not use @babel/preset-env to compile node_modules ([ykzts](https://github.com/tootsuite/mastodon/pull/10289))
- Change web UI to use new Web Share Target API ([gol-cha](https://github.com/tootsuite/mastodon/pull/9963))
- Change ActivityPub reports to have persistent URIs ([ThibG](https://github.com/tootsuite/mastodon/pull/10303))
- Change format of CSV exports of follows and mutes to include extra settings ([ThibG](https://github.com/tootsuite/mastodon/pull/10495), [ThibG](https://github.com/tootsuite/mastodon/pull/10335))
- Change ActivityPub collections to be cacheable by proxies ([ThibG](https://github.com/tootsuite/mastodon/pull/10467))
- Change REST API and public profiles to not return follows/followers for users that have blocked you ([Gargron](https://github.com/tootsuite/mastodon/pull/10491))
- Fix `tootctl accounts cull` sometimes removing accounts that are temporarily unreachable ([BenLubar](https://github.com/tootsuite/mastodon/pull/10460))
- Add support for IPv6 in e-mail validation ([zoc](https://github.com/tootsuite/mastodon/pull/10009))
- Add record of IP address used for signing up ([ThibG](https://github.com/tootsuite/mastodon/pull/10026))
- Add tight rate-limit for API deletions (30 per 30 minutes) ([Gargron](https://github.com/tootsuite/mastodon/pull/10042))
- Add support for embedded `Announce` objects attributed to the same actor ([ThibG](https://github.com/tootsuite/mastodon/pull/9998), [Gargron](https://github.com/tootsuite/mastodon/pull/10065))
- Add spam filter for `Create` and `Announce` activities ([Gargron](https://github.com/tootsuite/mastodon/pull/10005), [Gargron](https://github.com/tootsuite/mastodon/pull/10041), [Gargron](https://github.com/tootsuite/mastodon/pull/10062))
- Add `registrations` attribute to `GET /api/v1/instance` ([Gargron](https://github.com/tootsuite/mastodon/pull/10060))
- Add `vapid_key` to `POST /api/v1/apps` and `GET /api/v1/apps/verify_credentials` ([Gargron](https://github.com/tootsuite/mastodon/pull/10058))
### Fixed
- Fix link color and add link underlines in high-contrast theme ([Gargron](https://github.com/tootsuite/mastodon/pull/9949), [Gargron](https://github.com/tootsuite/mastodon/pull/10028))
- Fix unicode characters in URLs not being linkified ([JMendyk](https://github.com/tootsuite/mastodon/pull/8447), [hinaloe](https://github.com/tootsuite/mastodon/pull/9991))
- Fix URLs linkifier grabbing ending quotation as part of the link ([Gargron](https://github.com/tootsuite/mastodon/pull/9997))
- Temporarily pause timeline if mouse moved recently ([lmorchard](https://github.com/tootsuite/mastodon/pull/9200))
- Change the password form order ([mayaeh](https://github.com/tootsuite/mastodon/pull/9267))
- Redesign admin UI for accounts ([Gargron](https://github.com/tootsuite/mastodon/pull/9340), [Gargron](https://github.com/tootsuite/mastodon/pull/9643))
- Redesign admin UI for instances/domain blocks ([Gargron](https://github.com/tootsuite/mastodon/pull/9645))
- Swap avatar and header input fields in profile page ([ThibG](https://github.com/tootsuite/mastodon/pull/9271))
- When posting in mobile mode, go back to previous history location ([ThibG](https://github.com/tootsuite/mastodon/pull/9502))
- Split out is_changing_upload from is_submitting ([ThibG](https://github.com/tootsuite/mastodon/pull/9536))
- Back to the getting-started when pins the timeline. ([kedamaDQ](https://github.com/tootsuite/mastodon/pull/9561))
- Allow unauthenticated REST API access to GET /api/v1/accounts/:id/statuses ([Gargron](https://github.com/tootsuite/mastodon/pull/9573))
- Limit maximum visibility of local silenced users to unlisted ([ThibG](https://github.com/tootsuite/mastodon/pull/9583))
- Change API error message for unconfirmed accounts ([noellabo](https://github.com/tootsuite/mastodon/pull/9625))
- Change the icon to "reply-all" when it's a reply to other accounts ([mayaeh](https://github.com/tootsuite/mastodon/pull/9378))
- Do not ignore federated reports targetting already-reported accounts ([ThibG](https://github.com/tootsuite/mastodon/pull/9534))
- Upgrade default Ruby version to 2.6.0 ([Gargron](https://github.com/tootsuite/mastodon/pull/9688))
- Change e-mail digest frequency ([Gargron](https://github.com/tootsuite/mastodon/pull/9689))
- Change Docker images for Tor support in docker-compose.yml ([Sir-Boops](https://github.com/tootsuite/mastodon/pull/9438))
- Display fallback link card thumbnail when none is given ([Gargron](https://github.com/tootsuite/mastodon/pull/9715))
- Change account bio length validation to ignore mention domains and URLs ([Gargron](https://github.com/tootsuite/mastodon/pull/9717))
- Use configured contact user for "anonymous" federation activities ([yukimochi](https://github.com/tootsuite/mastodon/pull/9661))
- Change remote interaction dialog to use specific actions instead of generic "interact" ([Gargron](https://github.com/tootsuite/mastodon/pull/9743))
- Always re-fetch public key when signature verification fails to support blind key rotation ([ThibG](https://github.com/tootsuite/mastodon/pull/9667))
- Make replies to boosts impossible, connect reply to original status instead ([valerauko](https://github.com/tootsuite/mastodon/pull/9129))
- Change e-mail MX validation to check both A and MX records against blacklist ([Gargron](https://github.com/tootsuite/mastodon/pull/9489))
- Hide floating action button on search and getting started pages ([tmm576](https://github.com/tootsuite/mastodon/pull/9826))
- Redesign public hashtag page to use a masonry layout ([Gargron](https://github.com/tootsuite/mastodon/pull/9822))
- Use `summary` as summary instead of content warning for converted ActivityPub objects ([Gargron](https://github.com/tootsuite/mastodon/pull/9823))
- Display a double reply arrow on public pages for toots that are replies ([ThibG](https://github.com/tootsuite/mastodon/pull/9808))
- Change admin UI right panel size to be wider ([Kjwon15](https://github.com/tootsuite/mastodon/pull/9768))
- Escape HTML in profile name preview in profile settings ([pawelngei](https://github.com/tootsuite/mastodon/pull/9446))
- Use same CORS policy for /@:username and /users/:username ([ThibG](https://github.com/tootsuite/mastodon/pull/9485))
- Make custom emoji domains case insensitive ([Esteth](https://github.com/tootsuite/mastodon/pull/9474))
- Various fixes to scrollable lists and media gallery ([ThibG](https://github.com/tootsuite/mastodon/pull/9501))
- Fix bootsnap cache directory being declared relatively ([Gargron](https://github.com/tootsuite/mastodon/pull/9511))
- Fix timeline pagination in the web UI ([ThibG](https://github.com/tootsuite/mastodon/pull/9516))
- Fix padding on dropdown elements in preferences ([ThibG](https://github.com/tootsuite/mastodon/pull/9517))
- Make avatar and headers respect GIF autoplay settings ([ThibG](https://github.com/tootsuite/mastodon/pull/9515))
- Do no retry Web Push workers if the server returns a 4xx response ([Gargron](https://github.com/tootsuite/mastodon/pull/9434))
- Minor scrollable list fixes ([ThibG](https://github.com/tootsuite/mastodon/pull/9551))
- Ignore low-confidence CharlockHolmes guesses when parsing link cards ([ThibG](https://github.com/tootsuite/mastodon/pull/9510))
- Fix `tootctl accounts rotate` not updating public keys ([Gargron](https://github.com/tootsuite/mastodon/pull/9556))
- Fix CSP / X-Frame-Options for media players ([jomo](https://github.com/tootsuite/mastodon/pull/9558))
- Fix unnecessary loadMore calls when the end of a timeline has been reached ([ThibG](https://github.com/tootsuite/mastodon/pull/9581))
- Skip mailer job retries when a record no longer exists ([Gargron](https://github.com/tootsuite/mastodon/pull/9590))
- Fix composer not getting focus after reply confirmation dialog ([ThibG](https://github.com/tootsuite/mastodon/pull/9602))
- Fix signature verification stoplight triggering on non-timeout errors ([Gargron](https://github.com/tootsuite/mastodon/pull/9617))
- Fix ThreadResolveWorker getting queued with invalid URLs ([Gargron](https://github.com/tootsuite/mastodon/pull/9628))
- Fix crash when clearing uninitialized timeline ([ThibG](https://github.com/tootsuite/mastodon/pull/9662))
- Avoid duplicate work by merging ReplyDistributionWorker into DistributionWorker ([ThibG](https://github.com/tootsuite/mastodon/pull/9660))
- Skip full text search if it fails, instead of erroring out completely ([Kjwon15](https://github.com/tootsuite/mastodon/pull/9654))
- Fix profile metadata links not verifying correctly sometimes ([shrft](https://github.com/tootsuite/mastodon/pull/9673))
- Ensure blocked user unfollows blocker if Block/Undo-Block activities are processed out of order ([ThibG](https://github.com/tootsuite/mastodon/pull/9687))
- Fix unreadable text color in report modal for some statuses ([Gargron](https://github.com/tootsuite/mastodon/pull/9716))
- Stop GIFV timeline preview explicitly when it's opened in modal ([kedamaDQ](https://github.com/tootsuite/mastodon/pull/9749))
- Add Page to whitelisted ActivityPub types ([mbajur](https://github.com/tootsuite/mastodon/pull/9188))
- Add 20px to column width in web UI ([Gargron](https://github.com/tootsuite/mastodon/pull/9227))
- Add amount of freed disk space in `tootctl media remove` ([Gargron](https://github.com/tootsuite/mastodon/pull/9229), [Gargron](https://github.com/tootsuite/mastodon/pull/9239), [mayaeh](https://github.com/tootsuite/mastodon/pull/9288))
- Add "Show thread" link to self-replies ([Gargron](https://github.com/tootsuite/mastodon/pull/9228))
- Fix web UI crash when conversation has no last status ([sammy8806](https://github.com/tootsuite/mastodon/pull/9207))
- Fix follow limit validator reporting lower number past threshold ([Gargron](https://github.com/tootsuite/mastodon/pull/9230))
- Fix form validation flash message color and input borders ([Gargron](https://github.com/tootsuite/mastodon/pull/9235))
- Fix invalid twitter:player cards being displayed ([ThibG](https://github.com/tootsuite/mastodon/pull/9254))
- Fix emoji update date being processed incorrectly ([ThibG](https://github.com/tootsuite/mastodon/pull/9255))
- Fix playing embed resetting if status is reloaded in web UI ([ThibG](https://github.com/tootsuite/mastodon/pull/9270), [Gargron](https://github.com/tootsuite/mastodon/pull/9275))
- Fix web UI crash when favouriting a deleted status ([ThibG](https://github.com/tootsuite/mastodon/pull/9272))
- Fix intermediary arrays being created for hash maps ([Gargron](https://github.com/tootsuite/mastodon/pull/9291))
- Fix filter ID not being a string in REST API ([Gargron](https://github.com/tootsuite/mastodon/pull/9303))
- Fix resolving resources by URL not working due to a regression in [valerauko](https://github.com/tootsuite/mastodon/pull/9132) ([Gargron](https://github.com/tootsuite/mastodon/pull/9171))
- Fix reducer error in web UI when a conversation has no last status ([Gargron](https://github.com/tootsuite/mastodon/pull/9173))
- Add link ownership verification ([Gargron](https://github.com/tootsuite/mastodon/pull/8703))
- Add conversations API ([Gargron](https://github.com/tootsuite/mastodon/pull/8832))
- Add limit for the number of people that can be followed from one account ([Gargron](https://github.com/tootsuite/mastodon/pull/8807))
- Add admin setting to customize mascot ([ashleyhull-versent](https://github.com/tootsuite/mastodon/pull/8766))
- Add support for more granular ActivityPub audiences from other software, i.e. circles ([Gargron](https://github.com/tootsuite/mastodon/pull/8950), [Gargron](https://github.com/tootsuite/mastodon/pull/9093), [Gargron](https://github.com/tootsuite/mastodon/pull/9150))
- Add option to block all reports from a domain ([Gargron](https://github.com/tootsuite/mastodon/pull/8830))
- Add user preference to always expand toots marked with content warnings ([webroo](https://github.com/tootsuite/mastodon/pull/8762))
- Add user preference to always hide all media ([fvh-P](https://github.com/tootsuite/mastodon/pull/8569))
- Add `force_login` param to OAuth authorize page ([Gargron](https://github.com/tootsuite/mastodon/pull/8655))
- Change forms design ([Gargron](https://github.com/tootsuite/mastodon/pull/8703))
- Change reports overview to group by target account ([Gargron](https://github.com/tootsuite/mastodon/pull/8674))
- Change web UI to show "read more" link on overly long in-stream statuses ([lanodan](https://github.com/tootsuite/mastodon/pull/8205))
- Change design of direct messages column ([Gargron](https://github.com/tootsuite/mastodon/pull/8832), [Gargron](https://github.com/tootsuite/mastodon/pull/9022))
- Change home timelines to exclude DMs ([Gargron](https://github.com/tootsuite/mastodon/pull/8940))
- Change list timelines to exclude all replies ([cbayerlein](https://github.com/tootsuite/mastodon/pull/8683))
- Change admin accounts UI default sort to most recent ([Gargron](https://github.com/tootsuite/mastodon/pull/8813))
- Change documentation URL in the UI ([Gargron](https://github.com/tootsuite/mastodon/pull/8898))
- Change style of success and failure messages ([Gargron](https://github.com/tootsuite/mastodon/pull/8973))
- Change DM filtering to always allow DMs from staff ([qguv](https://github.com/tootsuite/mastodon/pull/8993))
- Change recommended Ruby version to 2.5.3 ([zunda](https://github.com/tootsuite/mastodon/pull/9003))
- Change docker-compose default to persist volumes in current directory ([Gargron](https://github.com/tootsuite/mastodon/pull/9055))
- Change character counters on edit profile page to input length limit ([Gargron](https://github.com/tootsuite/mastodon/pull/9100))
- Change notification filtering to always let through messages from staff ([Gargron](https://github.com/tootsuite/mastodon/pull/9152))
- Change "hide boosts from user" function also hiding notifications about boosts ([ThibG](https://github.com/tootsuite/mastodon/pull/9147))
- Change CSS `detailed-status__wrapper` class actually wrap the detailed status ([trwnh](https://github.com/tootsuite/mastodon/pull/8547))
- Fix crash in streaming API when tag param missing ([Gargron](https://github.com/tootsuite/mastodon/pull/8955))
- Fix hotkeys not working when no element is focused ([ThibG](https://github.com/tootsuite/mastodon/pull/8998))
- Fix some hotkeys not working on detailed status view ([ThibG](https://github.com/tootsuite/mastodon/pull/9006))
- Fix og:url on status pages ([ThibG](https://github.com/tootsuite/mastodon/pull/9047))
- Fix upload option buttons only being visible on hover ([Gargron](https://github.com/tootsuite/mastodon/pull/9074))
- Fix tootctl not returning exit code 1 on wrong arguments ([sascha-sl](https://github.com/tootsuite/mastodon/pull/9094))
- Fix preview cards for appearing for profiles mentioned in toot ([ThibG](https://github.com/tootsuite/mastodon/pull/6934), [ThibG](https://github.com/tootsuite/mastodon/pull/9158))
- Fix local accounts sometimes being duplicated as faux-remote ([Gargron](https://github.com/tootsuite/mastodon/pull/9109))
- Fix emoji search when the shortcode has multiple separators ([ThibG](https://github.com/tootsuite/mastodon/pull/9124))
- Fix dropdowns sometimes being partially obscured by other elements ([kedamaDQ](https://github.com/tootsuite/mastodon/pull/9126))
- Fix cache not updating when reply/boost/favourite counters or media sensitivity update ([Gargron](https://github.com/tootsuite/mastodon/pull/9119))
- Fix empty display name precedence over username in web UI ([Gargron](https://github.com/tootsuite/mastodon/pull/9163))
- Fix td instead of th in sessions table header ([Gargron](https://github.com/tootsuite/mastodon/pull/9162))
- Fix handling of content types with profile ([valerauko](https://github.com/tootsuite/mastodon/pull/9132))
