Hi @sinergyinaction,
I’ve tested now using Firefox 96.0.1 (64-bit), Chrome 97.0.4692.71 (Official Build) (64-bit) as well as Microsoft Edge 97.0.1072.62 (Official build) (64-bit). In all these browsers clicking on any thumbnail in the gallery opens the full size image within a Elementor lightbox.
FooGallery FREE itself does not contain a lightbox. By default clicking on a thumbnail should work exactly as if you have clicked on any other link within a page and should direct your browser to the URL provided in the HREF.
If no action at all is being observed as stated in your opening post, then something is intercepting that click event and preventing it from occurring.
Seeing as I am getting an Elementor lightbox popup, I would assumed this is what is preventing the default action for you for some reason.
Please can you try a couple things for me:
1. Make sure your various caches are cleared. Your site cache and browser cache. To clear Firefox cache you can force a hard reload of the page by holding down the Shift key on your keyboard while clicking the Reload page button. For your site cache this could be a plugin you have installed and how that is cleared would be determined by the plugin.
2. If the above does not make the Elementor lightbox display for you then please try simply logging out of your site and accessing the page as a logged out guest. The reason I propose trying this is often caching plugins perform different operations depending on whether or not you are logged in. This could help pinpoint if the issue is related to caching.
This does not seem to be an issue specifically related to FooGallery, but rather the Elementor lightbox attempting to display the images.
Thanks
Steve