Color the new tab button image appropriately

macos/Sources/Helpers/NSView+Extension.swift

@@ -1,6 +1,19 @@
 import AppKit
 
 extension NSView {
+    /// Recursively finds and returns the first descendant view that has the given class name.
+    func firstDescendant(withClassName name: String) -> NSView? {
+        for subview in subviews {
+            if String(describing: type(of: subview)) == name {
+                return subview
+            } else if let found = subview.firstDescendant(withClassName: name) {
+                return found
+            }
+        }
+
+        return nil
+    }
+
     /// Recursively finds and returns descendant views that have the given class name.
     func descendants(withClassName name: String) -> [NSView] {
         var result = [NSView]()