diff --git a/package.json b/package.json
index eb98c7e..46c524e 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "license": "AGPL-3.0-or-later",
   "scripts": {
     "build": "node scripts/build-extension.js",
-    "test": "node scripts/test-hostname.js && node scripts/test-activity-tracker.js && node scripts/test-protocol.js && node scripts/test-i18n.js && node scripts/test-popup-settings.js && node scripts/test-popup-catalog-fallback.js && node scripts/test-background-i18n.js && node scripts/test-firefox-github-release.js",
+    "test": "node scripts/test-hostname.js && node scripts/test-activity-tracker.js && node scripts/test-protocol.js && node scripts/test-i18n.js && node scripts/test-popup-settings.js && node scripts/test-popup-select-style.js && node scripts/test-popup-catalog-fallback.js && node scripts/test-background-i18n.js && node scripts/test-firefox-github-release.js",
     "sign:firefox": "./scripts/sign-firefox-xpi.sh",
     "release:firefox": "./scripts/release-firefox-xpi.sh",
     "publish:firefox": "./scripts/publish-firefox-github-release.sh",
diff --git a/scripts/test-popup-select-style.js b/scripts/test-popup-select-style.js
new file mode 100644
index 0000000..24fe2db
--- /dev/null
+++ b/scripts/test-popup-select-style.js
@@ -0,0 +1,10 @@
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+
+const css = fs.readFileSync(path.join(__dirname, '..', 'shared', 'popup', 'popup.css'), 'utf8');
+
+assert.match(css, /select\s*\{[^}]*appearance:\s*none/, 'popup select must hide the native arrow');
+assert.match(css, /select option\s*\{[^}]*background/, 'popup options must use the extension surface');
+
+console.log('browser extension popup select style test passed');
diff --git a/shared/popup/popup.css b/shared/popup/popup.css
index 20254ef..921435c 100644
--- a/shared/popup/popup.css
+++ b/shared/popup/popup.css
@@ -145,7 +145,17 @@ select {
   margin-top: 5px;
   border: 1px solid #374151;
   border-radius: 4px;
-  padding: 7px 8px;
+  padding: 7px 30px 7px 8px;
+  appearance: none;
+  background-color: #0f172a;
+  background-image: linear-gradient(45deg, transparent 50%, #94a3b8 50%), linear-gradient(135deg, #94a3b8 50%, transparent 50%);
+  background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%;
+  background-size: 5px 5px, 5px 5px;
+  background-repeat: no-repeat;
+  color: #e5e7eb;
+}
+
+select option {
   background: #0f172a;
   color: #e5e7eb;
 }