The MultimediaViewer extension gives wiki users a different interface for viewing full-size or nearly full-size images in their browser without extraneous page loads or confusing interstitial pages.

You will also likely want to download Rozšíření:CommonsMetadata . It is not a hard requirement, but without it, you will not get much information in the boxes showing details about the images.

On third-party wikis, even if you only use locally uploaded images, you need CommonsMetatada to populate the information in the boxes via a template holding information about the files.)

• $wgMediaViewerEnableByDefault and $wgMediaViewerEnableByDefaultForAnonymous will determine whether MultimediaViewer is enabled by default for everyone and anonymous users, respectively.

• $wgMediaViewerUseThumbnailGuessing will improve performance when enabled, but can be fragile depending on how the wiki is set up (it will probably work fine if you use a 404 handler).

Forced download

To ensure files are offered for download and not viewed in the user's browser following a click on the Download … button, the server has to be configured, except when using vagrant:

Next, go to a page that has a thumbnail on it. Try clicking on the image or on the "expand" icon near it. The lightbox should pop up and give you a bigger view of the image.

If you'd prefer, there's an exported test environment that you can use via "Special:Import" to set up a suitable testing environment quickly.