wip / i3wm ➔ hyprland

and, several clean-ups at the same time

obsolete/dots/firefox/userChrome.css

@@ -0,0 +1,9 @@
+/* disable top bar and top tabs */
+
+#TabsToolbar {
+    visibility: collapse;
+}
+
+#titlebar {
+    display: none;
+}