--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -4984,17 +4984,21 @@ pref("extensions.webextensions.remote", 
 pref("extensions.webextensions.protocol.remote", true);
 
 // Enable tab hiding API by default.
 pref("extensions.webextensions.tabhide.enabled", true);
 
 pref("extensions.webextensions.background-delayed-startup", false);
 
 // Whether or not the installed extensions should be migrated to the storage.local IndexedDB backend.
+#ifdef NIGHTLY_BUILD
+pref("extensions.webextensions.ExtensionStorageIDB.enabled", true);
+#else
 pref("extensions.webextensions.ExtensionStorageIDB.enabled", false);
+#endif
 
 // if enabled, store execution times for API calls
 pref("extensions.webextensions.enablePerformanceCounters", false);
 
 // Report Site Issue button
 pref("extensions.webcompat-reporter.newIssueEndpoint", "https://webcompat.com/issues/new");
 #if defined(MOZ_DEV_EDITION) || defined(NIGHTLY_BUILD)
 pref("extensions.webcompat-reporter.enabled", true);