Adding window rules for floating windows.

.config/niri/config.kdl

@@ -287,7 +287,7 @@ spawn-at-startup "nextcloud"
 
 hotkey-overlay {
     // Uncomment this line to disable the "Important Hotkeys" pop-up at startup.
-    // skip-at-startup
+    skip-at-startup
 }
 
 // Uncomment this line to ask the clients to omit their client-side decorations if possible.
@@ -339,6 +339,17 @@ window-rule {
     open-floating true
 }
 
+window-rule {
+    // This app-id regular expression will work for both:
+    // - host Firefox (app-id is "firefox")
+    // - Flatpak Firefox (app-id is "org.mozilla.firefox")
+    match app-id=r#"qalculate-gtk$"#
+    match app-id=r#"tastycharts$"#
+    match app-id=r#"tasty.javafx.launcher.LauncherFxApp$"# title="^tastytrade"
+    match app-id=r#"tasty.javafx.launcher.LauncherFxApp$"# title="tastytrade - Portfolio Report"
+    open-floating true
+}
+
 // Example: block out two password managers from screen capture.
 // (This example rule is commented out with a "/-" in front.)
 /-window-rule {