diff --git a/programs/cli/cli.ts b/programs/cli/cli.ts
index ab99ec96..4762dc5c 100755
--- a/programs/cli/cli.ts
+++ b/programs/cli/cli.ts
@@ -15,14 +15,17 @@ import {
   extensionStart,
   type StartOptions,
   extensionBuild,
-  type BuildOptions
-  // extensionPreview
+  type BuildOptions,
+  // extensionPreview,
+  type FileConfig
 } from 'extension-develop'
 import * as messages from './cli-lib/messages'
 import type {BrowsersSupported} from './types'
 import checkUpdates from './check-updates'
 import packageJson from './package.json'
 
+export {type FileConfig}
+
 // Before all, check for updates.
 checkUpdates(packageJson)
 
diff --git a/programs/develop/plugin-browsers/run-firefox/firefox/create-profile.ts b/programs/develop/plugin-browsers/run-firefox/firefox/create-profile.ts
index 624737f3..9b0b72ab 100644
--- a/programs/develop/plugin-browsers/run-firefox/firefox/create-profile.ts
+++ b/programs/develop/plugin-browsers/run-firefox/firefox/create-profile.ts
@@ -82,15 +82,15 @@ export function createUserDataDir(
 
   const preferences = firefoxMasterPreferences
 
-  const userPreferences = JSON.stringify({...preferences, ...configPreferences})
+  const userPreferences = {...preferences, ...configPreferences}
 
   if (fs.existsSync(dataDir)) {
-    profile = getProfile(browser, dataDir, preferences || {})
+    profile = getProfile(browser, dataDir, userPreferences)
   } else {
     addProgressBar(messages.creatingUserProfile(browser), () => {})
 
     fs.mkdirSync(dataDir, {recursive: true})
-    profile = createProfile(dataDir, preferences || {})
+    profile = createProfile(dataDir, userPreferences)
   }
 
   return profile