Firefox:
In Firefox, you can add specific websites to an allowed or exceptions list. Once you add a site to this list, pop-ups from that site are always visible. Mozilla's support pages show you how to manage pop-up blocker settings in Firefox.
Chrome:
Similar to Firefox, in Chrome you can add specific sites to an allowed list so pop-ups for that site always appear. For more information on how to manage pop-up settings in Chrome, have a look at Google's support documentation.
Safari:
If you've enabled Safari's pop-up blocker, you can still view your coin's Popup as expected. Safari's pop-up blocker doesn't block pop-ups from opening if you've clicked on a button or link on a web page.
Internet Explorer:
Microsoft's FAQ shows you how to turn Internet Explorer's pop-up blocker on and off.
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