|Mozilla Firefox 67
Click the hamburger menu (top right) and select "Options"
Click "Privacy & Security"
Go to "Permissions" and check "Block pop-up windows".
Click the "Exceptions..." button
Input the URL <http://icsd.ill.fr> and click the "Allow" button
Click "Save Changes"
|Microsoft Edge 40|
If ICSD tries to display a popup window, prompt to allow or block a site from allowing those pop-ups appears at the bottom of the screen in a dialog box across the bottom of the Microsoft Edge window.
You can choose to either allow the pop up just once or to always allow them from that site. If you do so, the URL
This is simple unless the prompt disappears before you have a chance to respond. In that case try again!