diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/noOnLoad/addBreadcrumb/subject.js b/dev-packages/browser-integration-tests/loader-suites/loader/noOnLoad/addBreadcrumb/subject.js
new file mode 100644
index 000000000000..5248f5438b8b
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/noOnLoad/addBreadcrumb/subject.js
@@ -0,0 +1,6 @@
+Sentry.addBreadcrumb({
+  category: 'auth',
+  message: 'testing loader',
+  level: 'error',
+});
+Sentry.captureMessage('test');
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/noOnLoad/addBreadcrumb/test.ts b/dev-packages/browser-integration-tests/loader-suites/loader/noOnLoad/addBreadcrumb/test.ts
new file mode 100644
index 000000000000..ac8297d6b9f3
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/noOnLoad/addBreadcrumb/test.ts
@@ -0,0 +1,22 @@
+import { expect } from '@playwright/test';
+
+import { sentryTest } from '../../../../utils/fixtures';
+import { envelopeRequestParser, waitForErrorRequestOnUrl } from '../../../../utils/helpers';
+
+sentryTest('should add breadcrumb to message', async ({ getLocalTestUrl, page }) => {
+  const url = await getLocalTestUrl({ testDir: __dirname });
+  const req = await waitForErrorRequestOnUrl(page, url);
+
+  const eventData = envelopeRequestParser(req);
+
+  expect(eventData.message).toBe('test');
+  expect(eventData.breadcrumbs?.length).toBe(1);
+  expect(eventData.breadcrumbs).toEqual([
+    {
+      category: 'auth',
+      level: 'error',
+      message: 'testing loader',
+      timestamp: expect.any(Number),
+    },
+  ]);
+});
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/init.js b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/init.js
new file mode 100644
index 000000000000..19552be67987
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/init.js
@@ -0,0 +1,8 @@
+Sentry.onLoad(function () {
+  Sentry.init({});
+  Sentry.addBreadcrumb({
+    category: 'auth',
+    message: 'testing loader',
+    level: 'error',
+  });
+});
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/subject.js b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/subject.js
new file mode 100644
index 000000000000..8dc5b1eeb966
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/subject.js
@@ -0,0 +1 @@
+Sentry.captureMessage('test');
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/test.ts b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/test.ts
new file mode 100644
index 000000000000..4df22bc99288
--- /dev/null
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/addBreadcrumb/test.ts
@@ -0,0 +1,22 @@
+import { expect } from '@playwright/test';
+
+import { sentryTest } from '../../../../utils/fixtures';
+import { envelopeRequestParser, waitForErrorRequestOnUrl } from '../../../../utils/helpers';
+
+sentryTest('should add breadcrumb from onLoad callback to message', async ({ getLocalTestUrl, page }) => {
+  const url = await getLocalTestUrl({ testDir: __dirname });
+  const req = await waitForErrorRequestOnUrl(page, url);
+
+  const eventData = envelopeRequestParser(req);
+
+  expect(eventData.message).toBe('test');
+  expect(eventData.breadcrumbs?.length).toBe(1);
+  expect(eventData.breadcrumbs).toEqual([
+    {
+      category: 'auth',
+      level: 'error',
+      message: 'testing loader',
+      timestamp: expect.any(Number),
+    },
+  ]);
+});
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureException/test.ts b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureException/test.ts
index 09a10464c22e..f79d659b16f0 100644
--- a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureException/test.ts
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureException/test.ts
@@ -11,3 +11,12 @@ sentryTest('captureException works', async ({ getLocalTestUrl, page }) => {
 
   expect(eventData.message).toBe('Test exception');
 });
+
+sentryTest('should set SENTRY_SDK_SOURCE value', async ({ getLocalTestUrl, page }) => {
+  const url = await getLocalTestUrl({ testDir: __dirname });
+  const req = await waitForErrorRequestOnUrl(page, url);
+
+  const eventData = envelopeRequestParser(req);
+
+  expect(eventData.sdk?.packages?.[0].name).toBe('loader:@sentry/browser');
+});
diff --git a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureExceptionInOnLoad/test.ts b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureExceptionInOnLoad/test.ts
index b3cf79bde5c2..90868c3e2e8f 100644
--- a/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureExceptionInOnLoad/test.ts
+++ b/dev-packages/browser-integration-tests/loader-suites/loader/onLoad/captureExceptionInOnLoad/test.ts
@@ -19,3 +19,20 @@ sentryTest('captureException works inside of onLoad', async ({ getLocalTestUrl,
 
   expect(eventData.message).toBe('Test exception');
 });
+
+sentryTest('should set SENTRY_SDK_SOURCE value', async ({ getLocalTestUrl, page }) => {
+  await page.route('https://dsn.ingest.sentry.io/**/*', route => {
+    return route.fulfill({
+      status: 200,
+      contentType: 'application/json',
+      body: JSON.stringify({ id: 'test-id' }),
+    });
+  });
+
+  const url = await getLocalTestUrl({ testDir: __dirname });
+  const req = await waitForErrorRequestOnUrl(page, url);
+
+  const eventData = envelopeRequestParser(req);
+
+  expect(eventData.sdk?.packages?.[0].name).toBe('loader:@sentry/browser');
+});
diff --git a/packages/browser/test/integration/suites/loader-specific.js b/packages/browser/test/integration/suites/loader-specific.js
deleted file mode 100644
index 6ebfd3fb84ab..000000000000
--- a/packages/browser/test/integration/suites/loader-specific.js
+++ /dev/null
@@ -1,43 +0,0 @@
-var loaderVariants = ['loader-with-no-global-init', 'loader-with-no-global-init-lazy-no'];
-
-for (var idx in loaderVariants) {
-  (function () {
-    describe(loaderVariants[idx], function () {
-      this.timeout(60000);
-      this.retries(3);
-
-      var sandbox;
-
-      beforeEach(function (done) {
-        sandbox = createSandbox(done, loaderVariants[idx]);
-      });
-
-      afterEach(function () {
-        document.body.removeChild(sandbox);
-      });
-
-      describe('Loader Specific Tests - With no Global init() call', function () {
-        it('should add breadcrumb from onLoad callback from undefined error', function () {
-          return runInSandbox(sandbox, function () {
-            Sentry.onLoad(function () {
-              initSDK();
-              Sentry.addBreadcrumb({
-                category: 'auth',
-                message: 'testing loader',
-                level: 'error',
-              });
-            });
-            setTimeout(function () {
-              Sentry.captureMessage('test');
-            });
-            undefinedMethod();
-          }).then(function (summary) {
-            assert.ok(summary.breadcrumbs);
-            assert.lengthOf(summary.breadcrumbs, 1);
-            assert.equal(summary.breadcrumbs[0].message, 'testing loader');
-          });
-        });
-      });
-    });
-  })();
-}
diff --git a/packages/browser/test/integration/suites/loader.js b/packages/browser/test/integration/suites/loader.js
deleted file mode 100644
index 55809f81e383..000000000000
--- a/packages/browser/test/integration/suites/loader.js
+++ /dev/null
@@ -1,67 +0,0 @@
-if (IS_LOADER) {
-  describe('Loader Specific Tests', function () {
-    it('should add breadcrumb from onLoad callback from undefined error', function () {
-      return runInSandbox(sandbox, function () {
-        Sentry.onLoad(function () {
-          Sentry.addBreadcrumb({
-            category: 'auth',
-            message: 'testing loader',
-            level: 'error',
-          });
-        });
-        setTimeout(function () {
-          Sentry.captureMessage('test');
-        });
-        undefinedMethod();
-      }).then(function (summary) {
-        if (IS_ASYNC_LOADER) {
-          assert.notOk(summary.events[0].breadcrumbs);
-        } else {
-          if (summary.events[0].breadcrumbs) {
-            assert.ok(summary.events[0].breadcrumbs);
-            assert.lengthOf(summary.events[0].breadcrumbs, 1);
-            assert.equal(summary.events[0].breadcrumbs[0].message, 'testing loader');
-          } else {
-            // This seems to be happening only in chrome
-            assert.notOk(summary.events[0].breadcrumbs);
-          }
-        }
-      });
-    });
-
-    it('should add breadcrumb from onLoad callback from undefined error with custom init()', function () {
-      return runInSandbox(sandbox, function () {
-        Sentry.onLoad(function () {
-          Sentry.init({ debug: true });
-          Sentry.addBreadcrumb({
-            category: 'auth',
-            message: 'testing loader',
-            level: 'error',
-          });
-        });
-        setTimeout(function () {
-          Sentry.captureMessage('test');
-        });
-        undefinedMethod(); // trigger error
-      }).then(function (summary) {
-        assert.ok(summary.events[0].breadcrumbs);
-        assert.lengthOf(summary.events[0].breadcrumbs, 1);
-        assert.equal(summary.events[0].breadcrumbs[0].message, 'testing loader');
-      });
-    });
-
-    it('should set SENTRY_SDK_SOURCE value', () => {
-      return runInSandbox(sandbox, function () {
-        Sentry.onLoad(function () {
-          Sentry.init({ debug: true });
-        });
-        setTimeout(function () {
-          Sentry.captureMessage('test');
-        });
-        undefinedMethod(); // trigger error
-      }).then(function (summary) {
-        assert.equal(summary.events[0].sdk.packages[0].name, 'loader:@sentry/browser');
-      });
-    });
-  });
-}
diff --git a/packages/browser/test/integration/suites/shell.js b/packages/browser/test/integration/suites/shell.js
index bec3ab7a8768..c8dcdb490104 100644
--- a/packages/browser/test/integration/suites/shell.js
+++ b/packages/browser/test/integration/suites/shell.js
@@ -24,7 +24,6 @@ function runVariant(variant) {
      */
     {{ suites/onunhandledrejection.js }} // biome-ignore format: No trailing commas
     {{ suites/builtins.js }} // biome-ignore format: No trailing commas
-    {{ suites/loader.js }} // biome-ignore format: No trailing commas
   });
 }
 
@@ -33,5 +32,3 @@ for (var idx in variants) {
     runVariant(variants[idx]);
   })();
 }
-
-{{ suites/loader-specific.js }} // biome-ignore format: No trailing commas