I think I just found out the problem. So it turned out the browser mistakenly thinks the new tab opened by the HTML tool was a spam popup, so it blocked it. I didn't know this until I tried using Mozilla Firefox, and it informed me my tool was trying to open a pop-up,p while other browsers did not inform me about this, so I think the tool has been frozen by the browser.

The solution is that you just need to go into the pop-up blocker settings of the browser and set an exception for those apps.