diff --git a/extensions/sandbox_test/init.lua b/extensions/sandbox_test/init.lua
index f3e1420..a8365c1 100644
--- a/extensions/sandbox_test/init.lua
+++ b/extensions/sandbox_test/init.lua
@@ -60,11 +60,26 @@ end
 
 -- Enabled when this module is loaded.
 -- Normally that happens when KEY_F10 is pressed on the client.
+local value_checker_enabled = true
 function M.check_value(value)
+	if not value_checker_enabled then return end
 	log:debug("sandbox_test.check_value()")
 	try_exploit.search_single_value(value)
 end
 __buildat_sandbox_debug_check_value_sub(M.check_value)
 
+local is_active = false
+
+function M.toggle() -- Called by client/app
+	if not is_active then
+		M.run()
+		value_checker_enabled = true
+		is_active = true
+	else
+		value_checker_enabled = false
+		is_active = false
+	end
+end
+
 return M
 -- vim: set noet ts=4 sw=4:
diff --git a/src/client/app.cpp b/src/client/app.cpp
index dd4103a..e050fd1 100644
--- a/src/client/app.cpp
+++ b/src/client/app.cpp
@@ -537,7 +537,7 @@ struct CApp: public App, public magic::Application
 					"if type(m) ~= 'table' then\n"
 					"    error('Failed to load extension "+extname+"')\n"
 					"end\n"
-					"m.run()\n";
+					"m.toggle()\n";
 			if(!run_script_no_sandbox(script)){
 				log_e(MODULE, "Failed to load and run extension %s", cs(extname));
 			}