not working in firefox

You are most welcome.
I have just checked and it works for me. Please let me know if you see it still not works.

Thank you for quick answer.
I would suppose problem with theme’s scripts, but it works in other browsers (there is no error in console, just click do nothing). You can check it here: https://www.realitynasbavia.sk/ I added selector #top in header’s code, because it didn’t add it too.
Thank you very much for your help.

You are welcome, Can you remove code that you edited ?

Done. I noticed that in Chrome there is code: <div id="top" class="row">,
but there is no similar code in Firefox.
Thank you for your time

Chrome Code:<a href="#top" title=""><i class="icon-up-open"></i></a>`

Firefox Code: <a title="" href="#top"><i class="icon-up-open"></i></a>
`
You can check here and its work fine Crowdsumos

I see, on your site there is this:
<a class="ut-offset-anchor" id="top" style="top:0px !important;"></a>
on mine in Firefox is not selector top so scrollup doesn’t work. But in Chrome there is, <div id="top" class="row">.

I think you need to remove your custom code or also you can re install the plugin