Great that your website is now working!
But I doubt that the problems had anything to do with browsers. I tested the website with three different browsers and the images were not displayed in any of them. Not until JoomlArt changed the image addresses from https://www.joomlart.com to https://static.joomlart.com, and that the website suddenly and simultaneously started working with displaying images in all three browsers. And that without new cache clearing.
Images on the old www addresses are still not available, see my link in a previous post, so this had nothing to do with the cache in the browser.