firefox: fixed to disable "Necko" WiFi scanning when there are no wireless-tools (see note)

Note:

The engine depends on iwlib!

www/firefox/firefox.conf

@@ -52,6 +52,15 @@ if pkginstalled libsvg-cairo ; then
 
 	EOT
 fi
+
+# wireless support
+if ! pkginstalled -f wireless-tools; then
+	cat <<-EOT >> .mozconfig
+	
+	ac_add_options --disable-necko-wifi
+
+	EOT
+fi
 }
 
 hook_add preconf  4 "firefox_config"