Hi David,
Could you pls recheck in mozila. If you will chec from mozila brouser then you can see comments about error
1)first error “TypeError: document.body is null”
2)if you push any buttons on website then you can see second error in mozila console “ReferenceError: yaCounter3520824 is not defined” – it is problem for all RU users that use Yandex Metria(same as Google Analytics) we can’t count qty. for each opened popup lead form
If i use Popup Maker & Yandex Metrika for other theme then i can count opened popup lead form, for example see website: http://i-fix-gadget.ru/