diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 961c703e13..c1c51a0fb0 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1152
-Changed: yurys@chromium.org Tue Aug  4 17:40:33 PDT 2020
+1153
+Changed: yurys@chromium.org Wed Aug  5 13:40:00 PDT 2020
diff --git a/browser_patches/firefox/preferences/playwright.cfg b/browser_patches/firefox/preferences/playwright.cfg
index d28fd7da1b..047820d03a 100644
--- a/browser_patches/firefox/preferences/playwright.cfg
+++ b/browser_patches/firefox/preferences/playwright.cfg
@@ -10,6 +10,10 @@ pref("ui.systemUsesDarkTheme", 0);
 //
 pref("dom.ipc.processCount", 60000);
 
+// Never reuse processes as they may keep previously overridden values
+// (locale, timezone etc.).
+pref("dom.ipc.processPrelaunch.enabled", false);
+
 // Do not use system colors - they are affected by themes.
 pref("ui.use_standins_for_native_colors", true);