diff --git components/embedder_support/user_agent_utils.cc components/embedder_support/user_agent_utils.cc
index 6e905c33c688c..2716d2943f1a9 100644
--- components/embedder_support/user_agent_utils.cc
+++ components/embedder_support/user_agent_utils.cc
@@ -15,6 +15,7 @@
 #include "base/version.h"
 #include "build/branding_buildflags.h"
 #include "build/build_config.h"
+#include "cef/libcef/common/cef_switches.h"
 #include "components/embedder_support/pref_names.h"
 #include "components/embedder_support/switches.h"
 #include "components/policy/core/common/policy_pref_names.h"
@@ -330,6 +331,12 @@ std::string GetMajorVersionForUserAgentString(
 
 std::string GetProductAndVersion(
     ForceMajorVersionToMinorPosition force_major_to_minor) {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kUserAgentProductAndVersion)) {
+    return command_line->GetSwitchValueASCII(
+        switches::kUserAgentProductAndVersion);
+  }
+
   if (ShouldForceMajorVersionToMinorPosition(force_major_to_minor)) {
     // Force major version to 99 and major version to minor version position.
     if (base::FeatureList::IsEnabled(