[epiphany] Fix setup of webextensions

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 7d73117519c792cccceb757c50bc7a8dd98f0ac9
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Tue Feb 2 18:19:11 2021 +0100

    Fix setup of webextensions
    
    Fixes: https://gitlab.gnome.org/GNOME/epiphany/-/issues/1435

 embed/web-process-extension/ephy-webextension-api.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/embed/web-process-extension/ephy-webextension-api.c 
b/embed/web-process-extension/ephy-webextension-api.c
index 281cc4b29..bd2f6e9c2 100644
--- a/embed/web-process-extension/ephy-webextension-api.c
+++ b/embed/web-process-extension/ephy-webextension-api.c
@@ -90,12 +90,9 @@ set_up_webextensions (EphyWebProcessExtension *extension,
   g_autoptr (JSCValue) result = NULL;
   const char *data;
   gsize data_size;
-  static gboolean setup = FALSE;
 
-  if (setup)
-    return;
-
-  setup = TRUE;
+  result = jsc_context_get_value (js_context, "browser");
+  g_assert (jsc_value_is_undefined (result));
 
   js_browser = jsc_value_new_object (js_context, NULL, NULL);
   jsc_context_set_value (js_context, "browser", js_browser);