diff --git a/packages/wxt/src/core/runners/web-ext.ts b/packages/wxt/src/core/runners/web-ext.ts
index 809b12492..1b56bec16 100644
--- a/packages/wxt/src/core/runners/web-ext.ts
+++ b/packages/wxt/src/core/runners/web-ext.ts
@@ -49,6 +49,7 @@ export function createWebExtRunner(): ExtensionRunner {
           : {
               chromiumBinary: wxtUserConfig?.binaries?.[wxt.config.browser],
               chromiumProfile: wxtUserConfig?.chromiumProfile,
+              chromiumPort: wxtUserConfig?.chromiumPort,
               chromiumPref: defu(
                 wxtUserConfig?.chromiumPref,
                 DEFAULT_CHROMIUM_PREFS,