Not sure how to over ride the code they have on the site. Keep Alive. *https://www.virustotal.com/#/url/a8f2794c93a8726bd0c71bc66884dad6085b72a8a6f56372db814454190c7873/details It is also a Malware Site and would think they need that time to try and install https://www.virustotal.com/#/url/a8f2794c93a8726bd0c71bc66884dad6085b72a8a6f56372db814454190c7873/detection I would suggest you do a scan for malware : *https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware *https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/ Found it : Copy/Paste into the Address Bar about:config then Enter Copy/Paste network.http.keep-alive into the top of the page search and wait. Change setting from 115 to 0 Note: Make sure remember what you have done as this is global in Firefox and not just the site. It is also just a work around and can still be over ridden. network.http.keep-alive Please let us know if this solved your issue or if need further assistance.

You can try to press ESC a few times quickly in a row. Sometimes if also works if you click a cancel button with one hand and immediately or simultaneously press Ctrl+W to close the tab.