diff --git a/packages/wxt/src/core/runners/web-ext.ts b/packages/wxt/src/core/runners/web-ext.ts
index f7efcdbe..1d45fea5 100644
--- a/packages/wxt/src/core/runners/web-ext.ts
+++ b/packages/wxt/src/core/runners/web-ext.ts
@@ -44,7 +44,7 @@ export function createWebExtRunner(): ExtensionRunner {
           ? {
               firefox: wxtUserConfig?.binaries?.firefox,
               firefoxProfile: wxtUserConfig?.firefoxProfile,
-              prefs: wxtUserConfig?.firefoxPrefs,
+              pref: wxtUserConfig?.firefoxPref,
               args: wxtUserConfig?.firefoxArgs,
             }
           : {
diff --git a/packages/wxt/src/types.ts b/packages/wxt/src/types.ts
index 284af1d7..f43bc9b4 100644
--- a/packages/wxt/src/types.ts
+++ b/packages/wxt/src/types.ts
@@ -992,7 +992,7 @@ export interface WebExtConfig {
   /**
    * @see https://extensionworkshop.com/documentation/develop/web-ext-command-reference/#pref
    */
-  firefoxPrefs?: Record<string, string>;
+  firefoxPref?: Record<string, boolean | number | string>;
   /**
    * @see https://extensionworkshop.com/documentation/develop/web-ext-command-reference/#args
    */