Opening the viewer lightbox doesn't affect the URL or browser history, so you can't easily save or share a link to an image you're viewing: if you just bookmark or copy-paste the link from your URL bar, when the link is opened you'll just see an article...
If you're in the know you can copy that "Learn more" link or manually right-click and pull up the raw image, but these are.... not pretty. :)
Could append a hash parameter on the URL (using history.pushState()/popState() when available) specifying the image to show in lightbox, and have a magic handler to open a popup on load if such a hash is specified.
something like https://en.wikipedia.org/wiki/San_Francisco#mediaview=File:SF_From_Marin_Highlands3.jpg ?
Version: unspecified
Severity: enhancement