diff --git a/src/extension-runners/chromium.js b/src/extension-runners/chromium.js
index 047c7874bc..c62629d180 100644
--- a/src/extension-runners/chromium.js
+++ b/src/extension-runners/chromium.js
@@ -299,15 +299,6 @@ export class ChromiumExtensionRunner {
       chromeFlags.push(`--profile-directory=${profileDirName}`);
     }
 
-    let startingUrl;
-    if (this.params.startUrl) {
-      const startingUrls = Array.isArray(this.params.startUrl)
-        ? this.params.startUrl
-        : [this.params.startUrl];
-      startingUrl = startingUrls.shift();
-      chromeFlags.push(...startingUrls);
-    }
-
     this.chromiumInstance = await this.chromiumLaunch({
       chromePath: chromiumBinary,
       chromeFlags,
diff --git a/tests/unit/test-extension-runners/test.chromium.js b/tests/unit/test-extension-runners/test.chromium.js
index 084d62891e..f287b34c7b 100644
--- a/tests/unit/test-extension-runners/test.chromium.js
+++ b/tests/unit/test-extension-runners/test.chromium.js
@@ -252,6 +252,7 @@ describe('util/extension-runners/chromium', async () => {
         '--enable-unsafe-extension-debugging',
         'url2',
         'url3',
+        `--load-extension=${reloadManagerExtension},/fake/sourceDir`,
       ],
       startingUrl: 'url1',
     });
@@ -281,8 +282,6 @@ describe('util/extension-runners/chromium', async () => {
         '--arg1',
         'arg2',
         '--arg3',
-        'url2',
-        'url3',
       ],
       startingUrl: 'url1',
     });