diff --git a/src/config/config.schema-regressions.test.ts b/src/config/config.schema-regressions.test.ts
index 3a04d720714..4125cb1b3d4 100644
--- a/src/config/config.schema-regressions.test.ts
+++ b/src/config/config.schema-regressions.test.ts
@@ -164,4 +164,24 @@ describe("config schema regressions", () => {
       expect(res.issues[0]?.path).toBe("channels.imessage.attachmentRoots.0");
     }
   });
+
+  it("accepts browser.extraArgs for proxy and custom flags", () => {
+    const res = validateConfigObject({
+      browser: {
+        extraArgs: ["--proxy-server=http://127.0.0.1:7890"],
+      },
+    });
+
+    expect(res.ok).toBe(true);
+  });
+
+  it("rejects browser.extraArgs with non-array value", () => {
+    const res = validateConfigObject({
+      browser: {
+        extraArgs: "--proxy-server=http://127.0.0.1:7890" as unknown,
+      },
+    });
+
+    expect(res.ok).toBe(false);
+  });
 });