It's not quite as transparent as DPReview, but this works for me.
For FireFox, install this extension: addons.mozilla.org/en-GB/firefox/addon/xifr/
Then if you hover the mouse over a picture and right click, an extra item is show which says 'View Exif Data'.
For Chrome (and, I assume Chrome clones such as Vivaldi), Install this extension chrome.google.com/webstore/detail/exif-viewer-classic/nafpfdcmppffipmhcpkbplhkoiekndck
Then, when you hover over a picture the exif data is shown in a blue border at the top of the picture.
Be aware that on this site, the large thumbnails that are generated do not include Exif data. But if you click on the URL below the picture and show that, the above methods should work.
I hope this helps. Please post any feedback (good or bad) here.
Alan