diff --git a/src/slic3r/GUI/PluginWebDialog.cpp b/src/slic3r/GUI/PluginWebDialog.cpp
index d89aac7270..b8e0a7756b 100644
--- a/src/slic3r/GUI/PluginWebDialog.cpp
+++ b/src/slic3r/GUI/PluginWebDialog.cpp
@@ -139,19 +139,32 @@ void PluginWebDialog::destroy_for_plugin(PluginWebDialog* dialog)
 
 void PluginWebDialog::on_bootstrap_event(wxWebViewEvent& event)
 {
-    // The first bootstrap load (or its error) triggers the swap to plugin HTML;
-    // the resulting plugin-page load is ignored (guarded by m_content_loaded).
-    load_plugin_content();
+    // The first bootstrap load (or its error) triggers the swap to plugin HTML.
+    if (!m_content_loaded)
+        load_plugin_content();
+#ifndef __WXMSW__
+    // WebKit reloads the SetPage base URL rather than the injected page, so a later main-frame
+    // load that is not our own SetPage is a browser reload, and the plugin HTML has to be put
+    // back. A post-load error only ever means a failed subresource. WebView2 reloads SetPage
+    // content from its own history entry, and reports in-document navigation as a load, so
+    // MSW needs neither the re-injection nor a guard against it.
+    else if (event.GetEventType() == wxEVT_WEBVIEW_LOADED) {
+        if (m_own_page_load)
+            m_own_page_load = false;
+        else
+            load_plugin_content();
+    }
+#endif
     event.Skip();
 }
 
 void PluginWebDialog::load_plugin_content()
 {
-    if (m_content_loaded)
-        return;
     m_content_loaded = true;
-    if (wxWebView* wv = browser())
+    if (wxWebView* wv = browser()) {
+        m_own_page_load = true;
         wv->SetPage(wxString::FromUTF8(m_html), web_base_url());
+    }
 }
 
 void PluginWebDialog::on_script_message(const nlohmann::json& payload)
diff --git a/src/slic3r/GUI/PluginWebDialog.hpp b/src/slic3r/GUI/PluginWebDialog.hpp
index 05f77f5148..50dd276621 100644
--- a/src/slic3r/GUI/PluginWebDialog.hpp
+++ b/src/slic3r/GUI/PluginWebDialog.hpp
@@ -72,6 +72,7 @@ private:
 
     std::string                   m_html;
     bool                          m_content_loaded{false};
+    bool                          m_own_page_load{false}; // a SetPage of the plugin HTML is in flight
     bool                          m_open{true};
     bool                          m_close_fired{false};
     std::optional<nlohmann::json> m_result;