diff --git a/src/main/Main.coffee b/src/main/Main.coffee
index d07866401..2408a40b9 100644
--- a/src/main/Main.coffee
+++ b/src/main/Main.coffee
@@ -66,6 +66,10 @@ Main =
     Conf['Bottom QR Link'] = true
     Conf['Toggleable Thread Watcher'] = true
 
+    # XXX Frames not yet supported in GM4.
+    if $.engine is 'gecko' and GM?
+      Conf['Force Noscript Captcha for v1'] = false
+
     # Enforce JS whitelist
     ($.getSync or $.get) {'jsWhitelist': Conf['jsWhitelist']}, ({jsWhitelist}) ->
       $.addCSP "script-src #{jsWhitelist.replace(/^#.*$/mg, '').replace(/[\s;]+/g, ' ').trim()}"