diff --git a/README.md b/README.md
index 1f0488d..c9f811f 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,16 @@ copy **easylist.txt** to ~/.config/wyebadblock
 
 this only checks 'easylist.txt'
 
+
+---
+
+Setting chars(whatever) to the env value $DISABLE_ADBLOCK disables adblock.
+
+For source code:
+set string ";adblock:false;" as user data of the
+webkit_web_context_set_web_extensions_initialization_user_data;
+
+
 ---
 
 ## webkit2gtk browsers
diff --git a/ephy-uri-tester.c b/ephy-uri-tester.c
index d90bdef..36c8cfd 100644
--- a/ephy-uri-tester.c
+++ b/ephy-uri-tester.c
@@ -987,6 +987,7 @@ G_MODULE_EXPORT void webkit_web_extension_initialize_with_user_data(
 		WebKitWebExtension *ex, const GVariant *v)
 {
 	bool enable = true;
+	bool hasarg = false;
 	if (v)
 	{
 		const gchar *str = g_variant_get_string((GVariant *)v, NULL);
@@ -995,10 +996,15 @@ G_MODULE_EXPORT void webkit_web_extension_initialize_with_user_data(
 			gchar **args = g_strsplit(str, ";", -1);
 			for (gchar **arg = args; *arg; arg++)
 				if (g_str_has_prefix(*arg, "adblock:"))
+				{
 					enable = strcmp(*arg + 8, "true") == 0;
+					hasarg = true;
+				}
 			g_strfreev(args);
 		}
 	}
+	if (!hasarg && *(g_getenv("DISABLE_ADBLOCK") ?: "") != '\0')
+		enable = false;
 
 	if (enable)
 		g_signal_connect(ex, "page-created", G_CALLBACK(initex), NULL);