diff --git a/app/controllers/auth/sessions_controller.rb b/app/controllers/auth/sessions_controller.rb
index 972731bb2..ecac4c5ba 100644
--- a/app/controllers/auth/sessions_controller.rb
+++ b/app/controllers/auth/sessions_controller.rb
@@ -198,8 +198,4 @@ class Auth::SessionsController < Devise::SessionsController
       format.all { super }
     end
   end
-
-  def second_factor_attempts_key(user)
-    "2fa_auth_attempts:#{user.id}:#{Time.now.utc.hour}"
-  end
 end
diff --git a/app/controllers/well_known/webfinger_controller.rb b/app/controllers/well_known/webfinger_controller.rb
index 2392cb82c..72f0ea890 100644
--- a/app/controllers/well_known/webfinger_controller.rb
+++ b/app/controllers/well_known/webfinger_controller.rb
@@ -19,6 +19,7 @@ module WellKnown
 
     def set_account
       username = username_from_resource
+
       @account = begin
         if username == Rails.configuration.x.local_domain || username == Rails.configuration.x.web_domain
           Account.representative
diff --git a/app/javascript/mastodon/components/column.jsx b/app/javascript/mastodon/components/column.jsx
index d737bd347..abc87a57e 100644
--- a/app/javascript/mastodon/components/column.jsx
+++ b/app/javascript/mastodon/components/column.jsx
@@ -22,13 +22,7 @@ export default class Column extends PureComponent {
       scrollable = document.scrollingElement;
     } else {
       scrollable = this.node.querySelector('.scrollable');
-
-      // Some columns have nested `.scrollable` containers, with the outer one
-      // being a wrapper while the actual scrollable content is deeper.
-      if (scrollable.classList.contains('scrollable--flex')) {
-        scrollable = scrollable?.querySelector('.scrollable') || scrollable;
-      }
-   }
+    }
 
     if (!scrollable) {
       return;
diff --git a/app/lib/activitypub/activity/flag.rb b/app/lib/activitypub/activity/flag.rb
index 78d5398d1..b7a412485 100644
--- a/app/lib/activitypub/activity/flag.rb
+++ b/app/lib/activitypub/activity/flag.rb
@@ -42,8 +42,4 @@ class ActivityPub::Activity::Flag < ActivityPub::Activity
   def report_comment
     (@json['content'] || '')[0...COMMENT_SIZE_LIMIT]
   end
-
-  def report_comment
-    (@json['content'] || '')[0...5000]
-  end
 end
diff --git a/app/lib/link_details_extractor.rb b/app/lib/link_details_extractor.rb
index 925f9a9fe..e4e815c38 100644
--- a/app/lib/link_details_extractor.rb
+++ b/app/lib/link_details_extractor.rb
@@ -302,11 +302,6 @@ class LinkDetailsExtractor
     nil
   end
 
-  def detect_encoding
-    guess = detector.detect(@html, @html_charset)
-    guess&.fetch(:confidence, 0).to_i > 60 ? guess&.fetch(:encoding, nil) : nil
-  end
-
   def detector
     @detector ||= CharlockHolmes::EncodingDetector.new.tap do |detector|
       detector.strip_tags = true
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index 6d37f8861..9a209aa77 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -22,10 +22,4 @@ class ApplicationMailer < ActionMailer::Base
       'X-Auto-Response-Suppress' => 'All'
     )
   end
-
-  def set_autoreply_headers!
-    headers['Precedence'] = 'list'
-    headers['X-Auto-Response-Suppress'] = 'All'
-    headers['Auto-Submitted'] = 'auto-generated'
-  end
 end
diff --git a/app/models/concerns/account/interactions.rb b/app/models/concerns/account/interactions.rb
index 6877a004a..536afba17 100644
--- a/app/models/concerns/account/interactions.rb
+++ b/app/models/concerns/account/interactions.rb
@@ -305,8 +305,4 @@ module Account::Interactions
   def normalized_domain(domain)
     TagManager.instance.normalize_domain(domain)
   end
-
-  def normalized_domain(domain)
-    TagManager.instance.normalize_domain(domain)
-  end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index e72a6a2c1..c32a575ed 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -128,8 +128,6 @@ class User < ApplicationRecord
   scope :matches_ip, ->(value) { left_joins(:ips).where('user_ips.ip <<= ?', value).group('users.id') }
 
   before_validation :sanitize_role
-  before_validation :sanitize_time_zone
-  before_validation :sanitize_locale
   before_create :set_approved
   after_commit :send_pending_devise_notifications
   after_create_commit :trigger_webhooks
diff --git a/app/services/fetch_link_card_service.rb b/app/services/fetch_link_card_service.rb
index 52f89ae79..7662fc1f2 100644
--- a/app/services/fetch_link_card_service.rb
+++ b/app/services/fetch_link_card_service.rb
@@ -15,9 +15,6 @@ class FetchLinkCardService < BaseService
     )
   }iox
 
-  # URL size limit to safely store in PosgreSQL's unique indexes
-  BYTESIZE_LIMIT = 2692
-
   def call(status)
     @status       = status
     @original_url = parse_urls
@@ -94,7 +91,7 @@ class FetchLinkCardService < BaseService
 
   def bad_url?(uri)
     # Avoid local instance URLs and invalid URLs
-    uri.host.blank? || TagManager.instance.local_url?(uri.to_s) || !%w(http https).include?(uri.scheme) || uri.to_s.bytesize > BYTESIZE_LIMIT
+    uri.host.blank? || TagManager.instance.local_url?(uri.to_s) || !%w(http https).include?(uri.scheme)
   end
 
   def mention_link?(anchor)
diff --git a/config/application.rb b/config/application.rb
index b0ea3dfcf..0013c7885 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -81,10 +81,6 @@ module Mastodon
     # config.time_zone = "Central Time (US & Canada)"
     # config.eager_load_paths << Rails.root.join("extras")
 
-    config.public_file_server.headers = {
-      'X-Content-Type-Options' => 'nosniff',
-    }
-
     # config.paths.add File.join('app', 'api'), glob: File.join('**', '*.rb')
     # config.autoload_paths += Dir[Rails.root.join('app', 'api', '*')]
 
diff --git a/spec/lib/account_statuses_filter_spec.rb b/spec/lib/account_statuses_filter_spec.rb
index d360e0e4a..777458512 100644
--- a/spec/lib/account_statuses_filter_spec.rb
+++ b/spec/lib/account_statuses_filter_spec.rb
@@ -211,20 +211,6 @@ RSpec.describe AccountStatusesFilter do
         end
       end
 
-      context 'when blocking an unrelated domain' do
-        let(:other_account) { Fabricate(:account, domain: nil) }
-        let(:reblogging_status) { Fabricate(:status, account: other_account, visibility: 'public') }
-        let!(:reblog) { Fabricate(:status, account: account, visibility: 'public', reblog: reblogging_status) }
-
-        before do
-          current_account.block_domain!('example.com')
-        end
-
-        it 'returns the reblog from the non-blocked domain' do
-          expect(subject.results.pluck(:id)).to include(reblog.id)
-        end
-      end
-
       context 'when muting a reblogged account' do
         let(:reblog) { status_with_reblog!('public') }
 
diff --git a/spec/lib/activitypub/tag_manager_spec.rb b/spec/lib/activitypub/tag_manager_spec.rb
index 3d6196212..05d2609b0 100644
--- a/spec/lib/activitypub/tag_manager_spec.rb
+++ b/spec/lib/activitypub/tag_manager_spec.rb
@@ -134,14 +134,6 @@ RSpec.describe ActivityPub::TagManager do
       reblog = Fabricate(:status, visibility: :public, account: alice, reblog: status)
       expect(subject.cc(reblog)).to include(subject.uri_for(bob))
     end
-
-    it 'returns poster of reblogged post, if reblog' do
-      bob    = Fabricate(:account, username: 'bob', domain: 'example.com', inbox_url: 'http://example.com/bob')
-      alice  = Fabricate(:account, username: 'alice')
-      status = Fabricate(:status, visibility: :public, account: bob)
-      reblog = Fabricate(:status, visibility: :public, account: alice, reblog: status)
-      expect(subject.cc(reblog)).to include(subject.uri_for(bob))
-    end
   end
 
   describe '#local_uri?' do
diff --git a/spec/lib/link_details_extractor_spec.rb b/spec/lib/link_details_extractor_spec.rb
index ba8c8969e..d8d9db0ad 100644
--- a/spec/lib/link_details_extractor_spec.rb
+++ b/spec/lib/link_details_extractor_spec.rb
@@ -100,12 +100,6 @@ RSpec.describe LinkDetailsExtractor do
             language: eq('en')
           )
       end
-
-      describe '#language' do
-        it 'returns the language from structured data' do
-          expect(subject.language).to eq 'en'
-        end
-      end
     end
 
     context 'when is wrapped in CDATA tags' do
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 1f0cf894f..d28e6658f 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -444,8 +444,6 @@ RSpec.describe User do
 
     let(:redis_pipeline_stub) { instance_double(Redis::Namespace, publish: nil) }
 
-    let(:redis_pipeline_stub) { instance_double(Redis::Namespace, publish: nil) }
-
     before { stub_redis }
 
     it 'changes the password immediately and revokes related access' do
diff --git a/spec/services/fetch_link_card_service_spec.rb b/spec/services/fetch_link_card_service_spec.rb
index aa9bf691f..1d61e33c0 100644
--- a/spec/services/fetch_link_card_service_spec.rb
+++ b/spec/services/fetch_link_card_service_spec.rb
@@ -235,19 +235,6 @@ RSpec.describe FetchLinkCardService do
       end
     end
 
-    context 'with an URL too long for PostgreSQL unique indexes' do
-      let(:url) { "http://example.com/#{'a' * 2674}" }
-      let(:status) { Fabricate(:status, text: url) }
-
-      it 'does not fetch the URL' do
-        expect(a_request(:get, url)).to_not have_been_made
-      end
-
-      it 'does not create a preview card' do
-        expect(status.preview_card).to be_nil
-      end
-    end
-
     context 'with a URL of a page with oEmbed support' do
       let(:html) { '<!doctype html><title>Hello world</title><link rel="alternate" type="application/json+oembed" href="http://example.com/oembed?url=http://example.com/html">' }
       let(:status) { Fabricate(:status, text: 'http://example.com/html') }
diff --git a/spec/services/notify_service_spec.rb b/spec/services/notify_service_spec.rb
index 33ef583c5..935b94c70 100644
--- a/spec/services/notify_service_spec.rb
+++ b/spec/services/notify_service_spec.rb
@@ -18,17 +18,6 @@ RSpec.describe NotifyService do
     expect { subject }.to_not change(Notification, :count)
   end
 
-  context 'when the sender is a local moderator' do
-    let(:sender) { Fabricate(:user, role: UserRole.find_by(name: 'Admin')).account }
-    let(:type) { :mention }
-    let(:activity) { Fabricate(:mention, account: recipient, status: Fabricate(:status, account: sender)) }
-
-    it 'does notify when the sender is blocked' do
-      recipient.block!(sender)
-      expect { subject }.to change(Notification, :count).by(1)
-    end
-  end
-
   it 'does not notify when sender is muted with hide_notifications' do
     recipient.mute!(sender, notifications: true)
     expect { subject }.to_not change(Notification, :count)
diff --git a/spec/services/post_status_service_spec.rb b/spec/services/post_status_service_spec.rb
index 179832abc..26db398d5 100644
--- a/spec/services/post_status_service_spec.rb
+++ b/spec/services/post_status_service_spec.rb
@@ -74,40 +74,6 @@ RSpec.describe PostStatusService do
         )
       end
     end
-
-    it 'returns existing status when used twice with idempotency key' do
-      account = Fabricate(:account)
-      status1 = subject.call(account, text: 'test', idempotency: 'meepmeep', scheduled_at: future)
-      status2 = subject.call(account, text: 'test', idempotency: 'meepmeep', scheduled_at: future)
-      expect(status2.id).to eq status1.id
-    end
-
-    context 'when scheduled_at is less than min offset' do
-      let(:invalid_scheduled_time) { 4.minutes.from_now }
-
-      it 'raises invalid record error' do
-        expect do
-          subject.call(account, text: 'Hi future!', scheduled_at: invalid_scheduled_time)
-        end.to raise_error(ActiveRecord::RecordInvalid)
-      end
-    end
-
-    it 'returns existing status when used twice with idempotency key' do
-      account = Fabricate(:account)
-      status1 = subject.call(account, text: 'test', idempotency: 'meepmeep', scheduled_at: future)
-      status2 = subject.call(account, text: 'test', idempotency: 'meepmeep', scheduled_at: future)
-      expect(status2.id).to eq status1.id
-    end
-
-    context 'when scheduled_at is less than min offset' do
-      let(:invalid_scheduled_time) { 4.minutes.from_now }
-
-      it 'raises invalid record error' do
-        expect do
-          subject.call(account, text: 'Hi future!', scheduled_at: invalid_scheduled_time)
-        end.to raise_error(ActiveRecord::RecordInvalid)
-      end
-    end
   end
 
   it 'creates response to the original status of boost' do