When you use the Back button on the browser you're instructing the browser to go to the last URL that it loaded. In this case that will be the last picture you viewed, as that is accessed via a URL.
There's nothing you or Atlassian can do about this, it's the behaviour of your browser (and all browsers).
There's no way to configure Confluence to show the pictures in some "non-URL" way, and realistically there isn't any sensible technical way to do this even if Atlassian wanted to.
ok, maybe I made my question unclear. Is there a 'way' or another gallery-plugin to present the pictures in a picture slider in a form of an overlay-layer, like its done on a gazillion of internet pages out there, without browser even getting note about the change of the picture.
cons: no direct picture url into the slider possible.
So with that being added, maybe you know of such a plugin?
I'm not aware of an add-on that does that, but that doesn't mean one doesn't exist. Have you searched the Atlassian Marketplace?
An alternative if you want to do some dirty work yourself is to embed a gallery in an iFrame, which might solve your problem. There's a link at the bottom of that page to a plugin if you don't want to use the HTML macro directly.
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