Here's a video of what's going on. I've tried to completely reset Safari by following several methods on the web but the issue persists.

I'm on Mojave using Safari 12.1. I have no idea what this issue is and can't find anything like it on the web. Help!

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    Try starting Safari in safe mode by holding Shift when clicking on the Safari icon and holing until it starts. – Allan Apr 19 '19 at 23:39
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    Welcome to Ask Different :) I have encountered this bug quite a few times myself. Most likely a bug in Safari/macOS. Consider filing a bug report to Apple. – Nimesh Neema Apr 19 '19 at 23:42
  • Nimesh if you've encountered this bug before how did you fix it? – Matt Kaye Apr 19 '19 at 23:52
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    The method as specified in the link you provided is from 2015 and may be incomplete. There are other com.apple.Safarixxxx.plist files in ~/Library/Preferences which may have some bearing on the problem. Because the pop-up window that flashes briefly is actually a dialog box that needs interaction before continuing, I suspect there is a corrupted Safari .plist file, perhaps one of the ones not specified in the method you linked to. Create a temporary new user to test if it is localized to your account, and try deleting some of the other .plist files as well which are not in the method linked. – IconDaemon Apr 20 '19 at 0:41
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    IconDaemon, you're spot on. Logging in as a guest user, Safari works just fine. Do you know of a site that provides a current list of .plist files? – Matt Kaye Apr 20 '19 at 0:56

So I just ended up installing the latest Beta version of Safari. I really just need the browser to test web development anyway. Not an ideal solution but whatever works.

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