Board Thread:Support Requests - Getting Started/@comment-174.3.252.88-20190531055302

Recently, when trying to browse fandom sites such as this one, Megami Tensei wiki, or Aselia, I get constant interruptions by a pop-up whenever I try to change my page (or even close a wind/tab containing a wiki page). It reads exactly "Are you sure you want to leave this page? Message from webpage: true". I have no idea what that means, and moreover it's rather annoying to have to close an extra message every time I want to go through or away from a wiki, especially when everything was working fine practically a month ago.

I'm certain it's not a virus having doublechecked with software such as Malwarebytes, and it this error only occurs on these types of wikis. I'm sorry if this isn't the place to ask, but I don't know where else to put this, and googling for answers gives me practically no results whatsoever, save for a couple other guys who asked this question too. Back in 2015. And nobody answered them. 