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You're probably gonna need to upgrade to a newer OS. I used to use a Windows XP (and mainly used Chrome as my browser) computer for the longest time, and one day this site straight up just stopped working for me on that device, think I might've gotten the same error message too. A few weeks ago I got a new desktop that runs on Windows 10, and now things are fine. IDK if the admins just made some change or something to the site that happened to make it incompatible with XP or what. But you'd have to get off of XP sometime eventually anyway, so....