lightbox close button not accesible in firefox

[sammik]

It is not possible to click lightbox close button.
galleria-lightbox-nextholder covers it.

it should be exs = 'z-index:99998' probably
https://github.com/aino/galleria/blob/master/src/galleria.js#L2191

[insanity54]

+1.

This seems to be caused by galleria-lightbox-nextholder being a different size every other picture. Example--

Picture 1, galleria-lightbox-nextholder takes up half the picture and covers the close button.
Picture 2, galleria-lightbox-nextholder is 106x106px and does not cover the close button.
Picture 3, galleria-lightbox-nextholder takes up half the picture and covers the close button.
... (continuation of above pattern)

changing exs = 'z-index:99999' to exs = 'z-index:98888' worked around the problem for me, so the exit button was always clickable.