Under Firefox, clicks on results to expand the image result in:

Too many calls to Location or History APIs within a short timeframe. k_ima.min.js:1:19232
Uncaught DOMException: The operation is insecure.
    onclick https://kagi.com/asset/v2/js/k_ima.min.js?v=f7409af16a06a7643ac6b103e8271bf557f6b553:1
    initImagePreview https://kagi.com/asset/v2/js/k_ima.min.js?v=f7409af16a06a7643ac6b103e8271bf557f6b553:1
    renderImagesPage https://kagi.com/asset/v2/js/k_ima.min.js?v=f7409af16a06a7643ac6b103e8271bf557f6b553:1
    <anonymous> https://kagi.com/asset/v2/js/k_ima.min.js?v=f7409af16a06a7643ac6b103e8271bf557f6b553:1
    scriptStreamDispatchEvent https://kagi.com/images?q=flush baseboard:1
    scriptStreamCallback https://kagi.com/images?q=flush baseboard:1
    <anonymous> https://kagi.com/images?q=flush baseboard:1015
k_ima.min.js:1

Or:

Uncaught (in promise) DOMException: Invalid encoded image data.

For roughly 80% of result images.

Basic usage of the image search (clicking on images to expand them) to work.