Uploading JXR files | WordPress.org

Hi, I am tackling the loading time of our site and note that I can improve it if I convert the JPG/PNG images on our site to JXR files. When I tried to upload a JXR image file, it was not allowed. So I downloaded the WP Extra File Types plugin. Of the list of options JXR was not there, so I need to complete the mandatory boxes at the bottom of the list but I’m not sure what I should type here. The fields are:

Description: (I added ‘JXR next gen’ but don’t know if this is correct)

File Extension: (I added ‘.JXR’)

MIME Type: (I added ‘image/jxr’)

When I clicked ‘Save’, where I had typed ‘.jxr’ became highlighted in yellow and ‘where I had typed ‘jxr’ in the MIME Type field became highlighted in orange. And this new format wasn’t added to the existing list which means that I still can’t use it!

Does anyone know how I can upload JXR images without touching any code. I thought this plugin would do the trick. Many thanks in advance.

The page I need help with: [log in to see the link]


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