Add firefox config

.config/firefox/user.js

@@ -0,0 +1,10 @@
+/*
+ * Note: has to be symlinked to profile directories for your
+ *       firefox release
+ *
+ * ```sh
+ * ln user.js ~/.mozilla/firefox/*.default-release/user.js
+ * ```
+ */
+
+user_pref('browser.download.dir', '/home/h/dl')