It works if right-click the selector and it also works with a left click if I disable JavaScript.
So it looks that some JavaScript running on that page if blocking/intercepting the left-click.

first page is working ok but if you proceed to second page then it doesnt let you click the Selector(ДСП and Количество дверей). however it was working ok in earlier versions of firefox. and still works ok in chrome. and yes there is javascript on that page so if you disable it then second page is not working at all as its is missing the doors

I was referring to the second page in my above post.

I disabled JavaScript as a test after loading the page with JavaScript enabled and that worked.
I also get the selects to open if I right-click instead of left-click the select.
That way the select get selected (shows a focus ring) and after that left-clicking works as well .

This assumes that JavaScript is monitoring the left-click, but that script no longer works properly.

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