User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0 Steps to reproduce: When I was browsing some site, a pop up ad window appear, the page address begins http://mainlink.cool/ At first I think it is just an annoying advertise site and I want to close it. However, I cannot. Check the screenshot in attachment. At first, it is opened full screen mode. With some fake Windows dialog (I am using Linux so I know it is fake), it tried to let me install their extensions. Then I press ESC to exit full screen. I click the close button of tab or window, but it doesn't work because it has this login dialog. I click close button of the login dialog or cancel button. Then the dialog will appear again. I click the Don't allow button of extension installation pop over, but it seems not clickable. I killed the Firefox process, which is the only solution for me.
Status: UNCONFIRMED → RESOLVED
Closed: 7 months ago
Resolution: --- → DUPLICATE
Duplicate of bug: 377496
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