feat(browser): Add skipBrowserExtensionCheck escape hatch option

dev-packages/browser-integration-tests/suites/manual-client/force-init-chrome-extension/init.js

@@ -0,0 +1,11 @@
+import * as Sentry from '@sentry/browser';
+
+window.Sentry = Sentry;
+
+// We mock this here to simulate a Chrome browser extension
+window.chrome = { runtime: { id: 'mock-extension-id' } };
+
+Sentry.init({
+  dsn: 'https://[email protected]/1337',
+  skipBrowserExtensionCheck: true,
+});

dev-packages/browser-integration-tests/suites/manual-client/force-init-chrome-extension/test.ts

@@ -0,0 +1,16 @@
+import { expect } from '@playwright/test';
+import { sentryTest } from '../../../utils/fixtures';
+
+sentryTest(
+  'initializes inside a Chrome browser extension if `skipBrowserExtensionCheck` is set',
+  async ({ getLocalTestUrl, page }) => {
+    const url = await getLocalTestUrl({ testDir: __dirname });
+    await page.goto(url);
+
+    const isInitialized = await page.evaluate(() => {
+      return !!(window as any).Sentry.isInitialized();
+    });
+
+    expect(isInitialized).toBe(true);
+  },
+);

packages/browser/src/client.ts

@@ -26,7 +26,26 @@ import { createUserFeedbackEnvelope } from './userfeedback';
  */
 export type BrowserOptions = Options<BrowserTransportOptions> &
   BrowserClientReplayOptions &
-  BrowserClientProfilingOptions;
+  BrowserClientProfilingOptions & {
+    /**
+     * Important: Only set this option if you know what you are doing!
+     *
+     * By default, the SDK will check if it is initialized in a browser extension
+     * if you call `Sentry.init`. In case it is, it will stop initialization
+     * because browser extensions require a different Sentry initialization process:
+     * https://docs.sentry.io/platforms/javascript/best-practices/shared-environments/
+     *
+     * Setting up the SDK in a browser extension with global error monitoring is not recommended
+     * and will likely flood you with errors from other web sites or extensions. This can heavily
+     * impact your quota and cause interference with your and other Sentry SDKs in shared environments.
+     *
+     * If this check wrongfully flags your setup as a browser extension, you can set this
+     * option to `true` to skip the check.
+     *
+     * @default false
+     */
+    skipBrowserExtensionCheck?: boolean;
+  };
 
 /**
  * Configuration options for the Sentry Browser SDK Client class

packages/browser/src/sdk.ts

@@ -160,7 +160,7 @@ declare const __SENTRY_RELEASE__: string | undefined;
 export function init(browserOptions: BrowserOptions = {}): Client | undefined {
   const options = applyDefaultOptions(browserOptions);
 
-  if (shouldShowBrowserExtensionError()) {
+  if (!options.skipBrowserExtensionCheck && shouldShowBrowserExtensionError()) {
     consoleSandbox(() => {
       // eslint-disable-next-line no-console
       console.error(