chore(firefox): Don't upgrade HTTP requests to HTTPS (#34465)

.github/workflows/tests_bidi.yml

@@ -7,7 +7,7 @@ on:
       - main
     paths:
       - .github/workflows/tests_bidi.yml
-      - packages/playwright-core/src/server/bidi/*
+      - packages/playwright-core/src/server/bidi/**
   schedule:
     # Run every day at midnight
     - cron: '0 0 * * *'

packages/playwright-core/src/server/bidi/third_party/firefoxPrefs.ts

@@ -139,6 +139,9 @@ function defaultProfilePreferences(
     'dom.min_background_timeout_value_without_budget_throttling': 0,
     'dom.timeout.enable_budget_timer_throttling': false,
 
+    // Disable HTTPS-First upgrades
+    'dom.security.https_first': false,
+
     // Only load extensions from the application and user profile
     // AddonManager.SCOPE_PROFILE + AddonManager.SCOPE_APPLICATION
     'extensions.autoDisableScopes': 0,