diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index f16e433cf..a4167ea0e 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -4,7 +4,8 @@
   "service": "app",
   "runServices": [
     "db",
-    "redis"
+    "redis",
+    "selenium"
   ],
   "workspaceFolder": "/workspace",
   "containerEnv": {
diff --git a/.devcontainer/docker-compose.yml b/.devcontainer/docker-compose.yml
index 3a48dc7a8..f622e3686 100644
--- a/.devcontainer/docker-compose.yml
+++ b/.devcontainer/docker-compose.yml
@@ -10,6 +10,7 @@ x-rails-env: &rails_env
   POSTGRES_PASSWORD: postgres
   BUNDLE_PATH: /bundle
   REDIS_URL: redis://redis:6379/1
+  SELENIUM_REMOTE_URL: http://selenium:4444
 
 services:
   app:
@@ -28,6 +29,7 @@ services:
     depends_on:
       - db
       - redis
+      - selenium
 
   worker:
     build:
@@ -59,6 +61,14 @@ services:
     environment:
       <<: *db_env
 
+  selenium:
+    image: selenium/standalone-chromium:latest
+    ports:
+      - "4444:4444"
+      - "7900:7900"
+    shm_size: 2gb
+    restart: unless-stopped
+
 volumes:
   postgres-data:
   redis-data:
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index bd4be1e07..1c098fd39 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -16,7 +16,7 @@ Purpose: provide short, actionable guidance so Copilot suggestions match project
 ### Testing
 - `bin/rails test` - Run all tests
 - `bin/rails test:db` - Run tests with database reset
-- `bin/rails test:system` - Run system tests only (use sparingly - they take longer)
+- `DISABLE_PARALLELIZATION=true bin/rails test:system` - Run system tests only (use sparingly - they take longer)
 - `bin/rails test test/models/account_test.rb` - Run specific test file
 - `bin/rails test test/models/account_test.rb:42` - Run specific test at line
 
@@ -37,7 +37,7 @@ Purpose: provide short, actionable guidance so Copilot suggestions match project
 - `bin/setup` - Initial project setup (installs dependencies, prepares database)
 
 ## Pre-PR workflow (run locally before opening PR)
-- Tests: bin/rails test (all), bin/rails test:system (when applicable)
+- Tests: bin/rails test (all), DISABLE_PARALLELIZATION=true bin/rails test:system (when applicable)
 - Linters: bin/rubocop -f github -a; bundle exec erb_lint ./app/**/*.erb -a
 - Security: bin/brakeman --no-pager
 
diff --git a/CLAUDE.md b/CLAUDE.md
index 1e2bcc321..ddd38afd0 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -12,10 +12,19 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ### Testing
 - `bin/rails test` - Run all tests
 - `bin/rails test:db` - Run tests with database reset
-- `bin/rails test:system` - Run system tests only (use sparingly - they take longer)
+- `DISABLE_PARALLELIZATION=true bin/rails test:system` - Run system tests only (use sparingly - they take longer)
 - `bin/rails test test/models/account_test.rb` - Run specific test file
 - `bin/rails test test/models/account_test.rb:42` - Run specific test at line
 
+#### System Tests in the Dev Container
+When running inside the Dev Container, the `SELENIUM_REMOTE_URL` environment variable is automatically set to the bundled `selenium/standalone-chromium` service. System tests will connect to that remote browser — no local Chrome installation is required.
+
+```bash
+DISABLE_PARALLELIZATION=true bin/rails test:system
+```
+
+To watch the browser live, open `http://localhost:7900` or `http://localhost:4444` in your host browser (password: `secret`).
+
 ### Linting & Formatting
 - `bin/rubocop` - Run Ruby linter
 - `npm run lint` - Check JavaScript/TypeScript code
@@ -38,7 +47,7 @@ ALWAYS run these commands before opening a pull request:
 
 1. **Tests** (Required):
    - `bin/rails test` - Run all tests (always required)
-   - `bin/rails test:system` - Run system tests (only when applicable, they take longer)
+   - `DISABLE_PARALLELIZATION=true bin/rails test:system` - Run system tests (only when applicable, they take longer)
 
 2. **Linting** (Required):
    - `bin/rubocop -f github -a` - Ruby linting with auto-correct
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c44b64524..a97e19f33 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -24,6 +24,9 @@ In general, _full features_ that get us closer to [our 🔜 Vision](https://gith
 To get setup for local development, you have two options:
 
 1. [Dev Containers](https://code.visualstudio.com/docs/devcontainers/containers) with VSCode (see the `.devcontainer` folder)
+   - A `selenium/standalone-chrome` service is included in the Dev Container setup, so **system tests work out of the box** — no local Chrome required.
+   - Run system tests: `DISABLE_PARALLELIZATION=true bin/rails test:system`
+   - Watch the browser live at `http://localhost:7900` or `http://localhost:4444` (password: `secret`)
 2. Local Development
    - [Mac Setup Guide](https://github.com/we-promise/sure/wiki/Mac-Dev-Setup-Guide)
    - [Linux Setup Guide](https://github.com/we-promise/sure/wiki/Linux-Dev-Setup-Guide)
diff --git a/test/application_system_test_case.rb b/test/application_system_test_case.rb
index a32c04b49..69724cda0 100644
--- a/test/application_system_test_case.rb
+++ b/test/application_system_test_case.rb
@@ -1,11 +1,38 @@
 require "test_helper"
+require "socket"
 
 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
   setup do
     Capybara.default_max_wait_time = 5
+
+    if ENV["SELENIUM_REMOTE_URL"].present?
+      server_port = ENV.fetch("CAPYBARA_SERVER_PORT", 30_000 + (Process.pid % 1000)).to_i
+      app_host = ENV["CAPYBARA_APP_HOST"].presence || IPSocket.getaddress(Socket.gethostname)
+
+      Capybara.server_host = "0.0.0.0"
+      Capybara.server_port = server_port
+      Capybara.always_include_port = true
+      Capybara.app_host = "http://#{app_host}:#{server_port}"
+    end
   end
 
-  driven_by :selenium, using: ENV["CI"].present? ? :headless_chrome : ENV.fetch("E2E_BROWSER", :chrome).to_sym, screen_size: [ 1400, 1400 ]
+  if ENV["SELENIUM_REMOTE_URL"].present?
+    Capybara.register_driver :selenium_remote_chrome do |app|
+      options = Selenium::WebDriver::Chrome::Options.new
+      options.add_argument("--window-size=1400,1400")
+
+      Capybara::Selenium::Driver.new(
+        app,
+        browser: :remote,
+        url: ENV["SELENIUM_REMOTE_URL"],
+        capabilities: options
+      )
+    end
+
+    driven_by :selenium_remote_chrome, screen_size: [ 1400, 1400 ]
+  else
+    driven_by :selenium, using: ENV["CI"].present? ? :headless_chrome : ENV.fetch("E2E_BROWSER", :chrome).to_sym, screen_size: [ 1400, 1400 ]
+  end
 
   private
 
diff --git a/test/system/settings_test.rb b/test/system/settings_test.rb
index d994881c5..099e55f6b 100644
--- a/test/system/settings_test.rb
+++ b/test/system/settings_test.rb
@@ -60,6 +60,7 @@ class SettingsTest < ApplicationSystemTestCase
     click_button "Generate new code"
     assert_selector 'span[data-clipboard-target="source"]', visible: true, count: 1 # invite code copy widget
     copy_button = find('button[data-action="clipboard#copy"]', match: :first) # Find the first copy button (adjust if needed)
+    page.execute_script("Object.defineProperty(navigator, 'clipboard', { value: { writeText: () => Promise.resolve() }, writable: true, configurable: true })") # Mock clipboard API due to browser security restrictions in tests
     copy_button.click
     assert_selector 'span[data-clipboard-target="iconSuccess"]', visible: true, count: 1 # text copied and icon changed to checkmark
   end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 5a227e964..5af3466ff 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -23,11 +23,26 @@ require "minitest/autorun"
 require "mocha/minitest"
 require "aasm/minitest"
 require "webmock/minitest"
+require "uri"
 
 VCR.configure do |config|
   config.cassette_library_dir = "test/vcr_cassettes"
   config.hook_into :webmock
   config.ignore_localhost = true
+  config.ignore_request do |request|
+    selenium_remote_url = ENV["SELENIUM_REMOTE_URL"]
+    next false if selenium_remote_url.blank?
+
+    request_uri = URI(request.uri)
+    selenium_uri = URI(selenium_remote_url)
+
+    request_uri.host.present? &&
+      selenium_uri.host.present? &&
+      request_uri.host == selenium_uri.host &&
+      request_uri.port == selenium_uri.port
+  rescue URI::InvalidURIError
+    false
+  end
   config.default_cassette_options = { erb: true }
   config.filter_sensitive_data("<OPENAI_ACCESS_TOKEN>") { ENV["OPENAI_ACCESS_TOKEN"] }
   config.filter_sensitive_data("<OPENAI_ORGANIZATION_ID>") { ENV["OPENAI_ORGANIZATION_ID"] }