add suppressWarnings config option

Author: suveshmoza

packages/wxt/src/core/resolve-config.ts

@@ -226,6 +226,7 @@ export async function resolveConfig(
     userConfigMetadata: userConfigMetadata ?? {},
     alias,
     experimental: defu(mergedConfig.experimental, {}),
+    suppressWarnings: mergedConfig.suppressWarnings ?? [],
     dev: {
       server: devServerConfig,
       reloadCommand,

packages/wxt/src/core/utils/manifest.ts

@@ -121,11 +121,14 @@ export async function generateManifest(
   // Warn if building for Firefox without data_collection_permissions
   if (
     wxt.config.browser === 'firefox' &&
-    !userManifest.browser_specific_settings?.gecko?.data_collection_permissions
+    !userManifest.browser_specific_settings?.gecko
+      ?.data_collection_permissions &&
+    !wxt.config.suppressWarnings.includes('firefoxDataCollection')
   ) {
     wxt.logger.warn(
-      'Firefox requires explicit data collection permissions. Consider adding `data_collection_permissions` to your manifest config.\n' +
-        'For more details, see: https://extensionworkshop.com/documentation/develop/firefox-builtin-data-consent/\n',
+      'Firefox requires `data_collection_permissions` for new extensions from November 3, 2025. Existing extensions are exempt for now.\n' +
+        'For more details, see: https://extensionworkshop.com/documentation/develop/firefox-builtin-data-consent/\n' +
+        'To suppress this warning, add `firefoxDataCollection` to `suppressWarnings` in your wxt config.\n',
     );
   }
 

packages/wxt/src/core/utils/testing/fake-objects.ts

@@ -305,6 +305,7 @@ export const fakeResolvedConfig = fakeObjectCreator<ResolvedConfig>(() => {
     hooks: {},
     vite: () => ({}),
     plugins: [],
+    suppressWarnings: [],
   };
 });
 

packages/wxt/src/types.ts

@@ -131,6 +131,17 @@ export interface InlineConfig {
    * object or promise.
    */
   manifest?: UserManifest | Promise<UserManifest> | UserManifestFn;
+  /**
+   * Suppress specific warnings during the build process.
+   *
+   * @example
+   * ```ts
+   * export default defineConfig({
+   *   suppressWarnings: ['firefoxDataCollection'],
+   * })
+   * ```
+   */
+  suppressWarnings?: string[];
   /**
    * Configure browser startup. Options set here can be overridden in a `web-ext.config.ts` file.
    */
@@ -1393,6 +1404,10 @@ export interface ResolvedConfig {
    */
   alias: Record<string, string>;
   experimental: {};
+  /**
+   * List of warning identifiers to suppress during the build process.
+   */
+  suppressWarnings: string[];
   dev: {
     /** Only defined during dev command */
     server?: {