Pop-up blocker settings, exceptions and troubleshooting
https://support.mozilla.org/en-US/kb/pop-blocker-settings-exceptions-troubleshooting
WEBPop-up windows, or pop-ups, are windows that appear automatically without your permission. They vary in size, but usually don't cover the whole screen. Some pop-ups open on top of the current Firefox window, while others appear underneath Firefox (pop-unders). Firefox allows you to control both pop-ups and pop-unders in Firefox Settings .
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